Large Truck Crash 
Causation Study 

Analytical 
User's Manual 


June 2006 
US Department of Transportation 


TABLE OF CONTENTS 


Introduction ..................................................................................................................................... 3


Programmers' Introduction to the LTCCS User's Manual and Data ................................................ 4


LTCCS Data Sets........................................................................................................................... 12


LTCCS Variable List....................................................................................................................... 17


Variable Definitions and Codes...................................................................................................... 37
Airbags Data Set...............................................................................................................38
Brakes Data Set................................................................................................................46
CargoShiftAssessments Data Set..................................................................................... 51
CDCCrush Data Set.......................................................................................................... 61
Crash Data Set.................................................................................................................. 71
CrashAssessment Data Set..............................................................................................78
CrashDiscussion Data Set ................................................................................................ 89
DMVViolation Data Set ..................................................................................................... 90
DriverAssessment Data Set..............................................................................................92
DriverDecisionAggression Data Set................................................................................ 115
DriverDrugs Data Set......................................................................................................127
DriverHealth Data Set ..................................................................................................... 129
DriverRecognitionDistraction Data Set ........................................................................... 140
DriverSleep Data Set ......................................................................................................149
Environment Data Set.....................................................................................................158
Events Data Set .............................................................................................................. 174
FactorAssessment Data Set ........................................................................................... 180
GeneralVehicle Data Set ................................................................................................ 204
HazMat Data Set.............................................................................................................253
HazMatInsp Data Set......................................................................................................255
Injuries Data Set..............................................................................................................257
JackknifeAssessments Data Set..................................................................................... 301
MCMISdriverData Data Set ............................................................................................ 307
MCMISviolation Data Set................................................................................................310
NonMotorists Data Set....................................................................................................325
Occupants Data Set........................................................................................................334
Overview Data Set .......................................................................................................... 358
PARViolations Data Set .................................................................................................. 404
SaferAuthorityStatus Data Set ........................................................................................ 407
SaferCarrier Data Set...................................................................................................... 408
SaferCrashSummary Data Set ....................................................................................... 414
SaferDriverCrashReport Data Set .................................................................................. 416
SaferDriverInspection Data Set ...................................................................................... 424
SaferDriverViolation Data Set ......................................................................................... 426
SaferInspectionsSummary Data Set............................................................................... 428
SaferInsurance Data Set................................................................................................. 432
SaferReview Data Set..................................................................................................... 435
SafeStat Data Set ...........................................................................................................437
TruckExterior Data Set.................................................................................................... 440
TruckInspection Data Set................................................................................................451
TruckUnits Data Set........................................................................................................466
VehicleEvents Data Set .................................................................................................. 478


LTCCS Analytical User's Manual • 30 June 2006 Table of Contents • i 


VehicleExterior Data Set.................................................................................................486
Index............................................................................................................................................ 500
Appendix A: LTCCS Sampling and Analytical Issues.................................................................509


LTCCS Analytical User's Manual • 30 June 2006 Table of Contents • ii 


Introduction 
The Motor Carrier Safety Improvement Act of 1999 (MCSIA), P.L. 106-159, mandated a study to 
determine the causes of, and contributing factors to, commercial motor vehicle crashes. The U.S. 
Department of Transportation’s (DOT) Federal Motor Carrier Safety Administration (FMCSA) and 
National Highway Traffic Safety Administration (NHTSA) conducted a multiyear, nationwide study 
of factors that contribute to truck crashes. The Large Truck Crash Causation Study’s (LTCCS) 
goal is to identify effective crash countermeasures. 

The LTCCS was conducted at 24 data collection sites in 17 States by researchers from NHTSA’s 
National Automotive Sampling System (NASS) and State truck inspectors. Crash data were 
coded in two NASS quality control Zone Centers and reviewed by FMCSA and NHTSA personnel 
and national truck crash experts. 

The LTCCS collected data on crashes from 2001 through 2003. An attempt was made to ensure 
that each crash involved at least one large truck with a gross vehicle weight rating of more than 
10,000 pounds, and resulted in at least one fatality or at least one incapacitating or non-
incapacitating but evident injury. Data were collected on up to 1,000 elements in each crash. To 
get the highest quality data possible, the onsite investigations began as soon as possible after the 
crash occurred. Data collection was performed at each crash site by a two-person team 
consisting of a trained researcher and a State truck inspector. Researchers collected data at 
crash scenes through driver, passenger, and witness interviews. 

Subsequent to the crash, each truck and truck driver were subjected to a thorough inspection. 
After leaving the crash scene, researchers collected additional interview data by telephone from 
motor carriers responsible for the trucks and surrogate drivers of trucks and other vehicles when 
the actual drivers could not be interviewed as a result of a fatal or serious injury. Researchers 
also reviewed police crash reports, hospitals records, and coroners’ reports. In addition, 
researchers often revisited the crash scene to make more accurate scene diagrams and search 
for additional data. 

Together the teams collected data on approximately 1,000 variables on each crash. Crash case 
data were provided to NHTSA crash experts for coding, difficult cases were reviewed by NHTSA 
and FMCSA headquarters staff, and finalized cases were sent to DOT’s Volpe National 
Transportation Systems Center for inclusion in the study’s electronic database. 

LTCCS Analytical User's Manual Introduction • 3 


Programmers' Introduction to the LTCCS User's Manual and Data 

Table Design 

There are 1070 crashes documented in the Large Truck Crash Causation Study (LTCCS) 
database. Each of these is assigned a unique CaseID. There were 2284 vehicles involved in the 
study crashes, each of which is assigned a VehicleNumber (from 1 to 30). Any vehicle in the 
database can be uniquely identified by CaseID and VehicleNumber. There are 3014 vehicle 
occupants and 53 non-motorists in the study. Each occupant is assigned an OccupantNumber 
(from 1 to 11). Each non-motorist is assigned a NonMotoristNumber (from 1 to 7). Occupants 
can be uniquely identified by CaseID, VehicleNumber, and OccupantNumber, and non-
motorists by CaseID and NonMotoristNumber. The database further identifies 2777 distinct 
events, each of which is one in a sequence of events which occur in the course of a crash. Each 
of these events can be uniquely identified by CaseID and EventSequence. 

When joining (i.e. merging) tables one must match those elements which uniquely identify 
records in the table, e.g. joining the VehicleEvents table with the GeneralVehicle table 
requires matching by common CaseID and VehicleNumber. 

There is one crash-level table, Crash and each row in this table corresponds to a single crash. 
This is the single most general, or "top-level" table. All other tables give finer levels of detail, with 
multiple rows per crash. The level of detail of the rows of a particular table can be determined by 
the introduction to the table given in the User's Manual. A description of the variables which must 
be taken together to uniquely identify each record are also given there. 

Variable Reference 

The LTCCS database (LTCCS DB) is released in three formats, SAS, MS-Excel, and plain text. 
Many of the values in the LTCCS DB are numeric codes corresponding to some meaningful value 
description. These values are captured by the SAS version of the LTCCS DB, but not the MS-
Excel or text versions. To assist users of the study data, a LTCCS DB Variable Reference table 
has been created for the Excel and text versions, which lists the LTCCS tables and variables with 
their code values and descriptions. By using this Variable Reference one may determine the 
meaning of a particular variable code value. This reference is automatically included in both the 
MS-Excel and text format download packages. 

Avoiding Difficulties 

It is recommended that the User's Manual be consulted carefully, rather than relying on intuitive 
interpretations of variable names. Most variables have integer values. In some cases these are 
literal values, e.g. counts. In others, these values are codes representing some other value which 
can be found in the variable reference. For example, the variable OCCFatality in dataset 
Crash does not represent the number of fatalities in the crash, but rather, whether there were 
any fatalities, as well as whether any fatalities were ruled due to disease rather than injury. 

Vehicle body type is identified by GVEBodyType in the GeneralVehicle dataset. By the 
methodology of the LTCCS large trucks are those with values for GVEBodyType = {60, 61, 62, 
63, 64, 66, 67, 68, 69, 70, 74, 78}. 

LTCCS Analytical User's ManualProgrammers' Introduction to the LTCCS User's Manual and Data • 4 


Examples 

All Trucks, Simple Count 

This algorithm obtains a simple, un-weighted count of the large trucks involved in the LTCCS. It 
demonstrates how to use the GVEBodyType variable to identify a particular vehicle as a large 
truck, and how to use the RATWeight variable to filter out invalid cases. Only cases with a 
positive RATWeight are valid for the purpose of the study. Invalid cases were included for 
purposes of qualitative analysis. 

1) Access GeneralVehicle table. 

2) Select only cases with values for GVEBodyType = {60, 61, 62, 63, 64, 66, 67, 68, 70, 74, 
78}. Depending on the programming environment used this may be more easily implemented by 
selecting cases where (GVEBodyType >= 60 & GVEBodyType <= 78 & GVEBodyType <> 65). 

3) Select only cases with values for RATWeight > 0. 
4) Count all remaining cases. This gives the unweighted number of large trucks in the LTCCS. 
5) Sum all values for RATWeight. This gives the weighted number of large trucks involved in 

serious crashes nation-wide. 

There are 1123 large trucks in the LTCCS. There are an estimated 141,200 large trucks involved 
in serious crashes nation-wide over the 33 month study period. 

Trucks by Vehicle Configuration 

The purpose of this table is to categorize large trucks involved in the LTCCS by vehicle 
configuration type, e.g. single-unit or tractor-trailer, and to give unweighted counts of the number 
of large trucks in each category. Single-unit vehicles are classified by their number of axles. 
Combination vehicles by the number of trailers being towed. 

1) Access TruckUnits table. 

2) Mark all vehicles with at least one value of AxlesUsed = {7, 8, 9}. 

3) Select only cases with values for RATWeight > 0. 

4) Create variable AxleCt. If AxlesNotUsed <= 3 then set AxleCt = AxlesUsed + 
AxlesNotUsed, else set AxleCt = AxlesUsed. Please note: values greater than three for 
AxlesNotUsed are not valid counts of axles. They indicate that the axles were not inspected, 
that this variable is not applicable, or that the count of axles not used is unknown. 

5) Count number of axles for each vehicle by summing the number of axles for each unit 
constituting that vehicle. 

6) Perform inner join (i.e. merge) of results with Overview table. 

7) Classify vehicles as follows: 

a. Vehicles with a single unit, a value of OVEConfiguration = 'R', and AxleCt = 2 are 
classified as "Single Unit - Two Axles", 
b. Vehicles with a single unit, a value of OVEConfiguration = 'R', and AxleCt > 2 are 
classified as "Single Unit - Three or More Axles", 
c. Vehicles with a single unit, a value of OVEConfiguration = 'R', and the number of 
axles is unknown (results from Step 2) are classified as "Single Unit - Axles Unknown", 
d. Vehicles with a value of OVEConfiguration = 'Not Insp' are classified as 
"Other/Unknown/Missing", 
e. Vehicles with a value of OVEConfiguration = 'T' are classified as "Combo Truck -
Truck Tractor (bobtail)", 
LTCCS Analytical User's ManualProgrammers' Introduction to the LTCCS User's Manual and Data • 5 


f. Vehicles with a value of OVEConfiguration = {'RF', 'RO'} are classified as "Combo 
Truck - Truck Pulling Trailer(s)", 
g. Vehicles with a value of OVEConfiguration = {'TO', 'TS', 'TSA'} are classified as 
"Combo Truck - Tractor pulling Trailer", 
h. Vehicles with a value of OVEConfiguration = {'TSAS', 'TSCS', 'TSF', 'TSXS'} are 
classified as "Combo Truck - Tractor pulling Two Trailers", 
i. Vehicles with a value of OVEConfiguration = {'ISS', 'ROO'} are classified as 
"Other/Unknown/Missing" (please note that the two cases included here, one instance of 
ISS and one instance of ROO may appear to fall under specific categories, but a review 
of the case discussion, CrashDiscussion.Discussion, shows them both to be 
unique and unusual cases and therefore valid instances of 'Other'). 
8) Sum vehicle counts in each classification and calculate percentage for each classification 
by dividing its count by the total number of large trucks (1123). 

Results are given in table 1 below. 

Table 1. Trucks by Vehicle Configuration 

Vehicle Configuration Unit Count Percentage 
Single Unit - Two Axles 124 11.0% 
Single Unit - Three Axles or more 157 14.0% 
Single Unit - Axles Unknown 2 0.2% 
Combo Truck - Truck Tractor – Bobtail 29 2.6% 
Combo Truck - Truck Tractor(s) 40 3.6% 
Combo Truck - Tractor pulling Trailer 697 62.1% 
Combo Truck - Tractor pulling Two Trailers 54 4.8% 
Other/Unknown/Missing 20 1.8% 
Total 1123 100.0% 

Trucks in Single-Vehicle Crashes by Critical Reason 

These crashes involved only a single vehicle. In every case that vehicle was a large truck; no 
passenger vehicles were involved in any of these crashes. The critical reason (ACRReason in 
table CrashAssessment, and OVEReason in table Overview) is the immediate reason for the 
critical event, which is the event that made the crash inevitable. 

The numbers in the second column represent the rounded estimates of how often these factors 
would be coded for all 141,200 estimated trucks involved in fatal and injury crashes that occurred 
during the 33-month period of the study. When the program is run, it will provide unrounded 
estimates. The numbers in this table have been rounded to the nearest 1,000 because they are 
National estimates and subject to sampling and nonsampling errors. The percentages in the last 
column are based on the unrounded estimates divided by 141,200 which is the unrounded 
estimate of trucks involved in fatal and injury crashes during the 33 months. 

1) Perform join (i.e. merge) of two tables, CrashAssessment and Crash using the CaseID 
variable. 

2) Select only cases with VehicleCount = 1. 

3) Select only cases with values for RATWeight > 0. Please note: this step is optional. 
Including this step will filter out large trucks which have zero weighting. There were 107 such 
cases, which were surveyed as part of the study but given a weight of zero because they did not 
meet the study criteria for one reason or another. These cases were still included in the study 
dataset, however, as additional qualitative data. 

LTCCS Analytical User's ManualProgrammers' Introduction to the LTCCS User's Manual and Data • 6 


4) For each value of ACRReason compute the sum of the values for RATWeight, i.e. group 
cases by values of ACRReason and take the weighted counts. Calculate percentage by dividing 
the weighted count by total weighted count. 

Results for step 4 are rounded and given in Table 2 below. 

5) Take results of 3) and take weighted counts of cases for each value of ReasonCat. 
Calculate percentage for reason category by dividing its count by the total number of large trucks. 

Results for step 5 are given in Table 3 below. 

Table 2. Trucks in Single-Vehicle Crashes by Critical Reason 

Critical Reason Number Percentage 
Too fast for curve/turn 9,000 22.3% 
Sleep, that is, actually asleep 5,000 12.8% 
Cargo shifted 3,000 6.6% 
Too fast for conditions to be able to respond... 2,000 6.4% 
Inattention (i.e., daydreaming) 2,000 5.9% 
Heart attack or other physical impairment of the ability... 2,000 5.9% 
Overcompensation 2,000 4.2% 
Poor directional control e.g., failing to control vehicle... 2,000 4.0% 
Critical event not coded to this vehicle 1,000 3.8% 
Inadequate surveillance (e.g., failed to look, looked but... 1,000 3.6% 
Type of driver error unknown 1,000 3.5% 
Internal distraction 1,000 3.4% 
Unknown recognition error 1,000 2.8% 
Aggressive driving behavior 1,000 2.1% 
Suspension failed 1,000 2.1% 
Degraded braking capability 1,000 2.0% 
Unknown critical non-performance * 1.3% 
Other decision error * 1.3% 
Tires/wheels failed * 1.0% 
Road design – other * 0.9% 
External distraction * 0.9% 
Brakes failed * 0.8% 
Slick roads (low friction road surface due to ice... * 0.6% 
Illegal maneuver * 0.4% 
Following too closely to respond to unexpected actions * 0.4% 
Other critical non-performance * 0.4% 
Wind gust * 0.3% 
Steering failed * 0.2% 
Misjudgment of gap or other's speed * 0.2% 
Unknown reason for critical event * 0.1% 
Road design - roadway geometry (e.g., ramp curvature) 0 0.0% 
Total 38,000 100.0% 

* Weighted numbers lower than 500 are rounded to zero. 
LTCCS Analytical User's ManualProgrammers' Introduction to the LTCCS User's Manual and Data • 7 


Table 3. Trucks in Single-Vehicle Crashes by Critical Reason Summary Category 

Reason Category Number Percentage 
Driver Decision Factor 13,000 33.1% 
Physical Driver Factor 8,000 20.3% 
Driver Recognition Factor 6,000 16.5% 
Vehicle Related Factor 5,000 12.7% 
Driver Performance Factor 4,000 11.6% 
No Driver Error 1,000 3.8% 
Environment - Highway 1,000 1.6% 
Environment - Weather * 0.3% 
Unknown Reason * 0.1% 
Total 38,000 100.0% 

* Weighted numbers lower than 500 are rounded to zero. 
One Truck/One Passenger Vehicle Crashes, Associated Factors 

One type of crash of particular interest to many investigators is the one truck/one passenger 
vehicle (PV) crash. These include any crash in which the first two vehicles to collide were a large 
truck and a passenger vehicle. This algorithm ignores vehicles involved in follow-on collisions. 
Only the first two vehicles to collide are of interest here. 

This algorithm describes compilation of a table showing the number of large trucks and 
passenger vehicles in one truck/one PV crashes by five associated crash factors, 1) prescription 
drug use, 2) traveling too fast for conditions, 3) braking system problem, 4) driver fatigue, and 5) 
weather. 

Two-vehicle crashes are included in this example only if one vehicle was a large truck, and the 
other a passenger vehicle. One example of a two-vehicle crash not included in this example is a 
two-vehicle crash involving two large trucks. Another example of a two-vehicle crash not included 
in this particular example would be a two-vehicle crash involving a large truck and a motorcycle. 
Additionally, multi-vehicle crashes are included in this example if and only if the first two vehicles 
to collide are a large truck and a passenger vehicle. In such a crash, only those two vehicles are 
included. Other vehicles involved in the pile-up are excluded from this particular example. The 
complexities of this example require that the vehicles to be used in the example be selected in 
two groups. The first group of vehicles are those involved in two-vehicle crashes. They are 
identified in steps 1 - 5. The second group of vehicles are those involved in multi-vehicle crashes. 
They are identified in steps 6 - 32. Step 33 merges these two groups of vehicles. 

The primary tasks involved in compiling this table are, 1) Classification of the vehicles involved in 
each event, 2) Identification of the two vehicles involved in the first collision, 3) Identification of 
one truck/one passenger vehicle crashes, and 4) Identification and summation of the associated 
factors relevant to all vehicles by vehicle type (i.e. truck versus passenger vehicle). 

1) Join (i.e. merge) the GeneralVehicle and Crash data sets. 

2) Select only cases for which VehicleCount = 2, TruckCount = 1, and CarCount = 1. 

3) Classify vehicles as follows: 

a. If 1 <= GVEBodyType <= 22, or 28 <= GVEBodyType <= 48, the vehicle is a Passenger 
Vehicle (PV), 
b. If 60 <= GVEBodyType <= 78 and GVEBodyType <> 65, the vehicle is a Truck, 
c. All other vehicles are classified as Other. 
4) Assign classifications to new variable called VehicleClass. 

5) Save results keeping only CaseID VehicleNumber VehicleClass and RATWeight. 

6) Join (i.e. merge) tables Events and GeneralVehicle by CaseID and VehicleNumber. 

LTCCS Analytical User's ManualProgrammers' Introduction to the LTCCS User's Manual and Data • 8 


7) Classify vehicles as follows: 

a. If 1 <= GVEBodyType <= 22, or 28 <= GVEBodyType <= 48, the vehicle is a Passenger 
Vehicle (PV), 
b. If 60 <= GVEBodyType <= 78 and GVEBodyType <> 65, the vehicle is a Truck, 
c. All other vehicles are classified as Other. 
8) Assign classifications to new variable called FirstVehicleClass. 
9) Rename VehicleNumber to FirstVehicleNumber. 
10) Save results. 
11) Access table Events. 
12) Select only cases for which EVEObjectContacted <> 0 and 
EVEObjectContacted <= 30.
13) Delete variable VehicleNumber. 
14) Rename EVEObjectContacted to VehicleNumber. 
15) Join (i.e. merge) results with table GeneralVehicle by CaseID and VehicleNumber. 
16) Classify vehicles as follows: 


a. If 1 <= GVEBodyType <= 22, or 28 <= GVEBodyType <= 48, the vehicle is a Passenger 
Vehicle (PV), 
b. If 60 <= GVEBodyType <= 78 and GVEBodyType <> 65, the vehicle is a Truck, 
c. All other vehicles are classified as Other. 
17) Assign classifications to new variable called SecondVehicleClass. 
18) Rename VehicleNumber to SecondVehicleNumber. 
19) Save results. 
20) Join (i.e. merge) results of step 10) and step 19) by CaseID and EventSequence. 
21) Select only cases with positive values for both FirstVehicleNumber and 
SecondVehicleNumber. 

22) Filter cases by selecting only the minimum value of EventSequence for each value of 
CaseID. 
23) Join (i.e. merge) results with Crash table. 
24) Select only cases with values for RATWeight > 0. Please note: this step is optional. Including 


this step will filter out large trucks which have zero weighting. There were 107 such cases, which 
were surveyed as part of the study but given a weight of zero because they did not meet the 
study criteria for one reason or another. These cases were still included in the study data set, 
however, as additional qualitative data. 


25) Select only cases for which VehicleCount > 2. 


26) Select only cases in which one vehicle is of type Truck and the other vehicle is of type 
Passenger Vehicle. 
27) Save results.
28) Rename variable FirstVehicleClass to VehicleClass and rename 


FirstVehicleNumber to VehicleNumber. 
29) Save results keeping only CaseID VehicleNumber VehicleClass and RATWeight. 
30) Access results from step 27). 
31) Rename variable SecondVehicleNumber to VehicleNumber and rename variable 


SecondVehicleClass to VehicleClass. 

LTCCS Analytical User's ManualProgrammers' Introduction to the LTCCS User's Manual and Data • 9 


32) Save results keeping only CaseID VehicleNumber VehicleClass and RATWeight. 

33) Concatenate results from steps 5), 29) and 32). 

34) Join (i.e. merge) results with DriverDecisionAggression table by CaseID and 
VehicleNumber. 

35) Create variable TooFast. If Speeding = 1 or Speeding = 2 or Speeding = 3, then set 
TooFast = RATWeight, else set TooFast = 0. 

36) Save Results. 

37) Access DriverDrugs table. Select only cases with DrugType = 1. This table consists of 
one row per drug used by the driver prior to the crash. For some cases there are multiple 
instances of prescription drug use by a driver. Eliminate repeat rows, i.e. there must be at most 
one row with value of DrugType = 1 per driver. 

38) Join (i.e. merge) results with results from step 36) by CaseID and VehicleNumber. 

39) Create variable PrescripDrug. If DrugType = 1, then set PrescripDrug = RATWeight, 
else set PrescripDrug = 0. 

40) Perform join (i.e. merge) of results with FactorAssessment table by CaseID and 
VehicleNumber. 

41) Create variable BrakeFactor. If BrakeFailure = 1 or BrakesOutOfAdjustment = 1 or 
BrakesInoperative = 1 or BrakesSystemDeficiency = 1, then set BrakeFactor = 
RATWeight, else set BrakeFactor = 0. 

42) Create variable WeatherFactor. If WeatherCount >= 1 and WeatherCount <= 6, then 
set WeatherFactor = RATWeight, else set WeatherFactor = 0. 

43) Join (i.e. merge) results with DriverAssessment table by CaseID and VehicleNumber. 

44) Create variable DriverFatigue. If Fatigue = 1, then set DriverFatigue = RATWeight, 
else set DriverFatigue = 0. 

45) Group cases by VehicleClass. The weighted number of large trucks or passenger vehicles 
in one truck/one passenger vehicle crashes that were speeding - or more specifically, traveling 
too fast for conditions - is the sum of the variable TooFast. Similarly, summing PrescripDrug 
yields the number of drivers taking prescription drugs. Summing BrakeFactor yields the 
number of vehicles with faulty brakes. Summing WeatherFactor yields the number of vehicles 
for which inclement weather was a factor (and as expected the number is the same for large 
trucks and passenger vehicles). Summing DriverFatigue yields the number of vehicles driven 
by fatigued drivers. Results are given below. 

46) Note that results are rounded to nearest 1000. Percentages are calculated by dividing the 
weighted count of vehicles per factor, by the total number of each type of vehicle involved in one 
truck/one PV crashes (i.e. 65460.17). 

LTCCS Analytical User's ManualProgrammers' Introduction to the LTCCS User's Manual and Data • 10 


Table 4. Vehicles Involved in One Truck/One Passenger Vehicle Crashes by Associated 
Factor. 

Truck PV 
Factor Number Percentage Number Percentage 
TooFast 10,000 15.3% 7,000 10.5% 
PrescripDrug 19,000 28.9% 23,000 34.8% 
BrakeFactor 18,000 27.0% 1,000 1.6% 
WeatherFactor 9,000 13.5% 9,000 13.5% 
DriverFatigue 5,000 7.4% 10,000 14.8% 

LTCCS Analytical User's ManualProgrammers' Introduction to the LTCCS User's Manual and Data • 11 


LTCCS Data Sets 
LTCCS data are available to the public in the form of 43 data sets. The data sets are available in 
SAS, Microsoft Excel, or delimited text versions. Ten of them are imported from SAFER 
(FMCSA's Safety and Fitness Electronic Records) and two are imported from MCMIS (Motor 
Carrier Management Information System) data. The rest contain researcher-collected data. 

• The Airbags data set contains all the airbag-related information for each of the vehicles 
involved in the crash. This material is provided as one record per airbag. 
• The Brakes data set contains information about the brake equipment on the vehicles. It is 
broken out by axle, which becomes part of the unique key of this data set. This material is 
provided as one record per axle for each truck involved in the crash for which brakes 
have been coded. 
• The CargoshiftAssessments data set contains detailed information on cargo shift events 
for all vehicles in the crash. Cargo shift is a pre-crash event. One record of this 
information is stored for each vehicle. 
• The CDCCrush data set contains detailed information about the crush profile for each 
impact, coded to a vehicle damaged in the crash. This material is provided as one record 
per unit/event/deformation location for any vehicle involved in the crash. 
• The Crash data set contains all details that are related to the crash itself, and not 
individual vehicles involved in the crash. There is one record per crash. The fields 
contained in this data set cover all the higher-level aspects of each case, such as highest 
injury severities. 
• The CrashAssessment data set contains assessment information for each vehicle and 
driver involved in the crash. One record of this information exists for each vehicle. 
• The CrashDiscussion data set contains the assessment summary for each vehicle and 
driver in the crash. This material is provided as one record per vehicle. 
• The DMVViolation data set contains information on the driver’s prior record of motor 
vehicle violations. One record is provided for each violation and is stored for each 
vehicle/driver where this information is available. 
• The DriverAssessment data set contains assessment information on the driver regarding 
level of attention, behavior, mental or emotional state prior to the crash. One record of 
this information exists for each vehicle/driver. 
• The DriverDecisionAggression data set contains a variety of data supporting the analyst’s 
assessment. It focuses particularly on the driver’s decisions and aggressive behavior. 
One record of this information exists for each vehicle/driver. 
• The DriverDrugs data set contains information supporting the analyst’s assessment on 
the driver’s use of any drug prior to the crash. One record of this information exists for 
each drug. 
• The DriverHealth data set contains a variety of data supporting the analyst’s assessment. 
It focuses particularly on the area of driver health. One record of this information exists 
for each vehicle/driver. 
• The DriverRecognitionDistraction data set contains a variety of data supporting the 
analyst’s assessment. It focuses particularly on the driver’s recognition and distraction. 
One record of this information exists for each vehicle/driver. 
LTCCS Analytical User's Manual LTCCS Data Sets • 12 


• The DriverSleep data set contains a variety of data supporting the analyst’s assessment. 
It focuses particularly on the area of driver sleep patterns and fatigue. One record of this 
information exists for each vehicle/driver. 
• The Environment data set contains information on the physical parameters of the 
roadway in the vicinity of the crash, any adverse weather conditions, how the driver was 
operating the vehicle and any distraction information if applicable. One record of this 
information is stored for each vehicle. 
• The Events data set contains all details that describe the events occurring during the 
crash. A record exists for each crash event. 
• The FactorAssessment data set contains a variety of data supporting the analyst’s 
assessment. It focuses particularly on roadway, environment, and vehicle-related factors. 
One record of this information exists for each vehicle. 
• The GeneralVehicle data set contains general information about the vehicle. This 
material is provided as one record per vehicle. 
• The HazMat data set contains information on hazardous material cargo for trucks 
carrying such material at the time of the crash. There is a record for each hazardous 
material. 
• The HazMatInsp data set contains information about hazardous material inspections for 
trucks carrying such material at the time of the crash. There is a record for each 
hazardous material inspection. 
• The Injuries data set contains all the injury information for occupants of vehicles involved 
in the crash. Each occupant injury is assigned a sequential injury number. This material 
is provided as one record per injury. 
• The IntvwCarrier data set contains information from the carrier on the carrier’s business 
operation and the truck driver. One record exists for each truck in the crash. 
• The IntvwDrAggresiveDriving data set contains information about driver behavior prior to 
the crash, based on the interviews. There may be multiple interviews per vehicle, which 
is reflected in InterviewType. One record is stored for each interview. 
• The IntvwDrAttention data set contains information about driver attention and any 
distractions prior to the crash, based on interviews. There may be multiple interviews per 
vehicle, which is reflected in InterviewType. One record is stored for each interview. 
• The IntvwDrCargoshift data set contains information about cargo shifting as a potential 
contributor to the crash, based on interviews. There may be multiple interviews per 
vehicle, which is reflected in InterviewType. One record is stored for each interview. 
• The IntvwDrCondition data set contains information about the condition of the vehicle 
involved in the crash, based on interviews. There may be multiple interviews per vehicle, 
which is reflected in InterviewType. One record is stored for each interview. 
• The IntvwDrDriver data set contains collected information from all the Interview 
documents focusing particularly on driver license status (CDL). There may be multiple 
interviews per vehicle, which is reflected in InterviewType. One record is stored for each 
interview. 
• The IntvwDrFatigue data set contains information about the driver and extent of fatigue, 
based on the interviews. There may be multiple interviews per vehicle, which is reflected 
in InterviewType. One record is stored for each interview. 
• The IntvwDrFire data set contains information from the driver regarding smoke or fire as 
a potential contributor to the crash, based on the interviews. There may be multiple 
LTCCS Analytical User's Manual LTCCS Data Sets • 13 


interviews per vehicle, which is reflected in InterviewType. One record is stored for each 
interview. 

• The IntvwDrHealth data set contains information on the general physical health of the 
driver prior to the crash, based on the interviews. There may be multiple interviews per 
vehicle, which is reflected in InterviewType. One record is stored for each interview. 
• The IntvwDrJackknife data set contains detailed information about the jackknife event 
that took place prior to the crash, based on the interviews. There may be multiple 
interviews per vehicle, which is reflected in InterviewType. One record is stored for each 
interview. 
• The IntvwDrPerception data set contains detailed information about the driver’s 
perception of events that took place prior to the crash, based on the interviews. There 
may be multiple interviews per vehicle, which is reflected in InterviewType. One record is 
stored for each interview. 
• The IntvwDrRollover data set contains information on the rollover event, based on the 
interviews. There may be multiple interviews per vehicle, which is reflected in 
InterviewType. One record is stored for each interview. 
• The IntvwDrSleep data set contains information on the driver regarding the extent of 
sleep obtained before the crash, based on the interviews. There may be multiple 
interviews per vehicle, which is reflected in InterviewType. One record is stored for each 
interview. 
• The IntvwDrTrip data set contains information regarding the trip underway prior to the 
crash, based on the interviews. There may be multiple interviews per vehicle, which is 
reflected in InterviewType. One record is stored for each interview. 
• The IntvwDrViolations data set contains information on any driving or equipment 
violations in effect prior to, or issued after, the crash, based on the interviews. There may 
be multiple interviews per vehicle, which is reflected in InterviewType. One record is 
stored for each interview. 
• The JackknifeAssessments data set contains jackknife information on all vehicles. This 
material is provided as one record per vehicle. 
• The MCMISdriverData data set contains the number of prior crashes, vehicle inspections 
and inspection violations associated with this driver as reported by the Motor Carrier 
Management Information System. One record is stored for each vehicle/driver where this 
information is available. 
• The MCMISviolation data set contains information on the specific inspection violations 
issued to a driver for previous inspections as reported by the Motor Carrier Management 
Information System. One record of this information exists for each violation. 
• The NonMotorists data set contains information on nonmotorists who were involved in the 
crash. One record is stored for each nonmotorist. 
• The Occupants data set contains all the information related to each of the occupants in 
the vehicles involved in the crash. Not all occupants in the vehicle are researched in 
detail, so for many occupant records these values are “Unknown.” This material is 
provided as one record per occupant. 
• The Overview data set contains a summary of factors coded to each vehicle involved in 
the crash. Data from select assessment variables in other data sets are provided here. 
This facilitates analysis of factors that may have contributed to the crash. However, it is 
important to note that the presence of a particular factor does not necessarily indicate 
causation. There is one record in the data set for each vehicle. 
LTCCS Analytical User's Manual LTCCS Data Sets • 14 


• The PARViolations data set contains violations filed against the driver as a result of the 
crash and reported on the Police Accident Report. One record of this information is 
stored for each violation charged. 
• The SaferAuthorityStatus data set includes information on the insurance licensing 
authority for the driver’s carrier. This material is imported from the FMCSA Safety and 
Fitness Electronic Records (SAFER) database and is provided as one record per 
vehicle/driver for which this carrier information is available. 
• The SaferCarrier data set contains information on the operations of the driver’s carrier 
from the FMCSA SAFER database. This material is provided as one record per 
vehicle/driver for which this carrier information is available. 
• The SaferCrashSummary data set contains summary crash information for the driver’s 
carrier reported to the FMCSA for a period of 4 years. Each record represents one year 
of data and four records are stored for each vehicle/driver for which this carrier 
information is available. 
• The SaferDriverCrashReport data set contains historical information for previous crashes 
involving the driver from the FMCSA SAFER database. One record of this information is 
stored for each previous crash listed on inspection reports for the driver. This information 
is provided for each vehicle/driver where available. 
• The SaferDriverInspection data set contains inspection information for the driver while 
employed by this carrier from the FMCSA SAFER database. One record of this 
information is stored for each inspection report and is provided for each vehicle/driver 
where available. 
• The SaferDriverViolation data set includes information on any violation issued to the 
driver while employed by this carrier from the FMCSA SAFER database. One record of 
this information is stored for each violation listed on inspection reports for the driver. This 
information is provided for each vehicle/driver where available. 
• The SaferInspectionsSummary data set contains a summary of vehicle, driver, and 
hazardous material inspection information for the driver’s carrier reported to the FMCSA 
for the period of 2 years prior to the date of inquiry. This material is provided as one 
record per vehicle/driver for which this carrier information is available. 
• The SaferInsurance data set includes information on the type and status of insurance that 
the driver’s carrier holds from the FMCSA SAFER database. This material is provided as 
one record per vehicle/driver for which this carrier information is available. 
• The SaferReview data set contains the safety ratings of the driver’s carrier based on their 
compliance with FMCSA regulations from the FMCSA SAFER database. One record of 
this information is provided for each carrier review and reviews are stored for each 
vehicle/driver where this information is available. 
• The SafeStat data set contains safety statistics for the driver’s carrier from the FMCSA 
SAFER database. Scores are compiled for driver, vehicle, accident, and the safety 
management areas. One record of this information is provided for each SafeStat score 
assigned to a carrier. These scores are stored for each vehicle/driver where this 
information is available. 
• The TruckExterior data set contains information on each truck in the crash. Passenger 
vehicles involved in the crash are not included in this data set but instead are covered 
under VehicleExterior. This material is provided as one record per truck involved in the 
crash. 
• The TruckInspection data set combines information on Federal inspection violations. 
There may be more than one record per truck. Each record represents a violation. 
LTCCS Analytical User's Manual LTCCS Data Sets • 15 


• The TruckUnits data set contains detailed information about each unit involved in the 
crash. This includes both power units and trailers, where applicable, as indicated by the 
position field, which is part of the key of this data set. This material is provided as one 
record per truck unit. 
• The VehicleEvents data set contains information about events, such as safety equipment 
deployment and fires that occurred during and immediately after the crash. One record 
exists for each vehicle. 
• The VehicleExterior data set contains information on each passenger vehicle in the 
crash. Trucks are not included in this data set but instead are covered under 
TruckExterior. This material is provided as one record for each passenger vehicle 
involved in the crash. 
LTCCS Analytical User's Manual LTCCS Data Sets • 16 


LTCCS Variable List 
The following variables are contained in all of the data sets: 

CaseID 

The CaseID number is the identifier for the case. This variable is a unique number assigned to 
each crash. It appears on each data set and is used to merge the various information from the 
data sets together. 

PSU 

The PSU number refers to the geographic location of the Primary Sampling Unit investigating the 
case. There are 25 possible values ranging from 2 to 82. A PSU is either a large central city, a 
county surrounding a city, or a group of counties. This variable appears on each data set. 

PSUStrata 

PSUStrata refers to the number assigned to a crash during the first stage of sample selection. 
Analysts use the PSUStrata number and the SUDAAN statistical system to calculate variance. 
This variable appears on each data set. 

RATWeight 

The RATWeight is the multiplier used to produce national estimates from the data. This variable 
appears on each data set. 

The following variable is found in all vehicle-level the data sets: 

VehicleNumber 

The VehicleNumber is the number assigned to each vehicle in the case. This variable appears 
on each vehicle level data set and is used in conjunction with the CaseID variable to merge 
information from vehicle level data sets together. 

The following pages contain a list of all the variables in the LTCCS data sets. The list is 
organized alphabeticaly by data set. Within each data set, the variables are listed in the order 
they appear in the data set. The list displays the variable’s title, the variable’s name, and the 
page number where the variable can be found in the manual. 

LTCCS Analytical User's Manual LTCCS Variable List • 17 


VARIABLE LIST 

Airbags Data Set
Variable Title Variable Name Page


Air Bag Occupant Number 

Seat Row 1 

Seat Location 1 

Seat Row 2 

Seat Location 2 

Deployment Location Of Air Bag 

Air Bag Status 

Type Of Air Bag 

Redesigned Air Bag 

Air Bag Deployment 

Indications Of Air Bag Failure? 

Type Of Cutoff Switch 

Cutoff Switch Position Status 

Did Air Bag Module Cover Flaps Open At 
Designated Tear Points? 

Were The Cover Flaps Damaged? 

Was There Damage To The Air Bag? 

Source Of Air Bag Damage 

Had The Vehicle Been In Previous Crashes? 

Had Any Prior Maintenance/Service Been 
Performed On Air Bag System? 

CDC For Air Bag Deployment Impact 

Was The Air Bag In This Occupant’s Position 
Contacted By Another Occupant? 

AIROccupantNumber 38 
SeatRow1 38 
SeatLocation1 38 
SeatRow2 39 
SeatLocation2 39 
AirbagLocation 39 
AirbagStatus 40 
AirbagType 40 
Depowered 40 
Deployment 41 
AirbagFailure 41 
SwitchType 41 
SwitchStatus 42 

FlapsOpen 42 
FlapsDamaged 43 
AirbagDamage 43 
DamageSource 44 
PriorCrashes 44 

PriorMaintenance 44 
CDC 45 

ContactOther 45 

Brakes Data Set
Variable Title Variable Name Page


Axle 
Brake Type 
Brake Axle Position 
ABS Installed? 
ABS Functional? 
Adjustor Type 
Chamber Size 
Chamber Type 
Stroke Type 
Left Length 
Right Length 

Variable Title 

Axle 46 
BrakeType 46 
BRAPosition 46 
ABSInstalled 47 
ABSFunctional 47 
AdjustorType 47 
ChamberSize 48 
ChamberType 48 
StrokeType 49 
LeftLength 49 
RightLength 49 

CargoShiftAssessments Data Set 

Variable Name Page 

Type Of Cargo Shift Event ACSType 51 
Vehicle Location At Start Of Cargo Shift ACSLocation 51 
Movement Count MovementCount 52 

LTCCS Analytical User's Manual LTCCS Variable List • 18 


Cause Count 
Precrash Cargo Spillage? 
Driving At Constant Velocity 
Traversing A Curve 
Completing Turn 
Light Braking 
Accelerating 
Completing Avoidance Maneuver 
Other Event Circumstance 
Throttle Input Only 
Moderate Braking 
Heavy Braking 
Traversing A Straight Section 
Improper Loading (General Freight) 
Improper Loading (Bulk Freight) 

CauseCount 52 
ACSSpillage 52 
ACSConstant 53 
ACSCurve 53 
ACSTurn 53 
ACSLightBraking 54 
ACSAccelerating 54 
ACSAvoidance 54 
OtherMovement 55 
ACSDecelerating 55 
ACSModerateBraking 55 
ACSHeavyBraking 56 
ACSStraight 56 
ImproperGeneralLoading 56 
ImproperBulkLoading 57 

Inadequate Securement (Number Of Tie Downs)SparseTieDowns 57 
Inadequate Securement (Strength Of Tie 

 Downs) 
Other Source Of Solids Shift 
Less Than Full Load (Slosh) 
Baffle Failure 
Compartment Partition Failure 
Tank Failure 
Other Source Of Liquid Shift 
Other Cargo Shift Types 
Unknown Cause Of Cargo Shift 

Variable Title 

WeakTieDowns 57 
OtherSolids 58 
Sloshing 58 
BaffleFailure 58 
CompartmentFailure 58 
TankFailure 59 
OtherLiquids 59 
OtherCargos 59 
UnknownCause 60 

CDCCrush Data Set 

Variable Name Page 

Position Number 
Deformation Classification Type 
Object Contacted Category 
CDC Object Contacted 
Force Direction 
Clock Force 
Override/Underride 
Deformation Location 
Deformation – Longitudinal Or Lateral 
Deformation – Vertical Or Lateral 
Deformation Distribution 
Deformation Extent 
Deform Code 
Impact Number 
Direct Damage Location 
Field L Location 
Max Crush Location 
CDC Category 
CDC Width 

PositionNumber 61 
DCType 61 
ObjectContactClass 62 
CDCObjectContact 62 
ForceDirection 64 
ClockForce 64 
OverrideDesc 64 
DeformLocation 65 
DeformLong 65 
DeformVertical 66 
DeformDistribution 67 
DeformExtent 67 
DeformCode 68 
ImpactNumber 68 
DamageLocation 68 
FieldLocation 69 
MaxCrushLocation 69 
CDCCategory 69 
CDCWidth 69 

LTCCS Analytical User's Manual LTCCS Variable List • 19 


Crash Data Set 

Variable Title Variable Name Page 

Crash Date 
Time Of Crash 
Total Number Of Vehicles In Crash 
Truck Count 
Car Count 
Nonmotorist Count 
Crash Summary 
Injury Crash Severity Code – Police 
Injury Crash Severity Code – Researched 
Case Summary 
Collision Type 
Medical Treatment 
Occupant Fatality 
Alcohol Involvement? 
Drug Involvement? 

CrashDate 71 
CrashTime 71 
VehicleCount 71 
TruckCount 72 
CARCount 72 
NonMotoristCount 72 
CrashType 72 
CrashPARSevCode 73 
CrashRESSevCode 73 
Summary 74 
CollisionType 75 
Treatment 76 
OCCFatality 77 
CRAAlcohol 77 
AnyDrugsCrash 77 

CrashAssessment Data Set
Variable Title Variable Name Page


Pre-Event Movement 
Critical Precrash Event 
Critical Precrash Event Categories 
Critical Reason For The Critical Event 
Critical Reason Categories 
Attempted Avoidance Maneuver 
Pre-Impact Stability 
Pre-Impact Location 
Right-Of-Way? 
Crash Type 
Crash Configuration 
Jackknife 
Cargo Shift 

PreEventMovement 78 
ACRCriticalEvent 79 
CriticalEventCat 80 
ACRReason 81 
ReasonCat 82 
ACRAvoidance 83 
ACRStability 84 
ACRLocation 84 
ACRRightOfWay 84 
CrashCode 85 
AccidentCat 87 
ACRJackknife 88 
ACRCargoshift 88 

CrashDiscussion Data Set 

Variable Title Variable Name Page 

Case Summary Discussion 89 

DMVViolation Data Set 

Variable Title Variable Name Page 

License State LicState 90 
Citation Date CitDate 90 
Conviction Date ConvDate 90 
ACD Code ACDcode 91 
ACD Detail ACDdetail 91 
Violation Description ViolDescription 91 

LTCCS Analytical User's Manual LTCCS Variable List • 20 


DriverAssessment Data Set
Variable Title Variable Name Page


Was This Driver’s Sight Line To The Other 
Vehicle Clear? 

Was This Driver’s View Of The Other Vehicle 
Obscured? 

Was This Driver Required To Stop Prior To 
Crash Occurrence? 

Period Of Time Stopped Prior To Entering 
Intersection And/Or Initiating Turn 

SightLine 92 
Obscured 92 
StopRequired 93 
TimeStopped 93 

After Checking For Traffic, Did This Driver Focus 

On Intended Turn Destination Or Other 
Location? 

Sleep Related To Work Schedule 

Sleep Related To Social Schedule 

Sleep Related To Personal Problems 

Sleep Related To Family Problems 

Sleep Related To Illness 

No Driver Present 

Sleep Related To Other Factor 

Sleep Related To Unknown Factor 

Alcohol Use 

Alcohol Test 

Source Of BAC Test Result 

Time Delay (Between Crash And BAC Test) 

Illegal Drug Use 

Driver Fatigue 

Was The Driver Upset Prior To The Crash? 

Was The Driver In A Hurry Prior To Crash? 

Other Emotional Factors 

Vehicle Familiarity 

Roadway Familiarity 

Work Pressure Factors Count 

Learning New Position 

Production/Shipping Deadlines 

Work Schedule Pressure 

Additional Production/Sales Requirements 

Forced To Accept Loads With Little Or No 
Advance Notice 

Demoted 

Self Induced Work Pressure - Illegal 

Self Induced Work Pressure - Other 

Other Work Pressure 

Comfort Count 

Uncomfortable With Surrounding Traffic 
Densities 

Uncomfortable With General Traffic Speeds 

Uncomfortable with General Traffic Flow 

Uncomfortable With Some Aspect Of 
Vehicle/Load 

Other Comfort Factor 

Under Pressure To Accept Loads 

Work Fatigue Factors Count 

Scheduled Loads Require Extended Hours 

Scheduled Trips Require Rotating Shift 

Focused 94 
ADRWorkSchedule 94 
SocialSchedule 95 
PersonalProblems 95 
FamilyProblems 96 
Illness 96 
NoDriverPresent 96 
ADROtherFactor 97 
UnknownFactor 97 
AlcoholUse 97 
AlcoholTest 98 
TestSource 98 
TestDelay 99 
DrugTest 99 
Fatigue 100 
Upset 100 
Hurrying 101 
Emotional 101 
KnewVehicle 102 
KnewRoad 102 
WorkPressureCount 103 
NewPosition 103 
ShippingDeadline 104 
EXPWorkSchedule 104 
Quotas 104 

ExtraLoads 105 
Demoted 105 
SelfInducedIllegal 105 
SelfInducedOther 106 
OtherPressure 106 
ComfortCount 107 

TrafficDensity 107 
TrafficSpeed 107 
ADRTrafficFlow 108 

VehicleLoad 108 
OtherComfortFactor 108 
LoadPressure 109 
WorkFatigueCount 109 
ScheduledExtensions 110 
RotatingShift 110 

LTCCS Analytical User's Manual LTCCS Variable List • 21 


Unscheduled Loads Require Extended Hours 
Not Applicable – Under Pressure To Operate 
Even If Fatigued 
Other Fatigue-Related Factors 
Other Pressure Count 
Required To Accept Short Notice Trips 
Required To Fill In For Other Drivers 
Required To Complete Unpaid Loading 
Variable Compensation Package 
Not Applicable – Other Relation Factor Types 
Other Carrier Relation Factors 

UnscheduledExtensions 110 

NoApplicableFatigue 111 
OtherFatigue 111 
OtherPressureCount 112 
ShortNoticeTrips 112 
FillInTrips 112 
UnpaidLoading 113 
VariableCompensation 113 
NoApplicableRelations 113 
OtherRelations 114 

DriverDecisionAggression Data Set 

Variable Title Variable Name Page 

Traveling Too Fast For Conditions Speeding 115 
Following Too Closely Tailgating 115 
Misjudgment Of Gap Distance Or Velocity Of 

Other Vehicle Misjudgment 116 
Other Vehicle Approaching From This Driver’s Approach 116 
Police Reported Travel Speed ADATravelSpeed 117 
Posted Speed Limit ADAPostedSpeed 117 
False Assumption Of Other Road User’s Actions Assumption 118 
Inadequate Evasive Action Evasion 118 
Other Decision Factors ADAOtherFactor 119 
Illegal Maneuver Count ManeuverCount 119 
Crossed Full Barrier Lines While Passing CrossedLine 120 
Passed On Right (Drive Off Pavement To Pass) Undertaking 120 

Turned From Wrong Lane 
Initiated Illegal U-Turn 
Failed To Stop For TCD 
Drove Wrong Way On One-Way Road 
Other Illegal Maneuver 
Aggression Count 
Speeding 
Tailgating 
Weaving In And Out Of Traffic 
Intentional Violation Of Traffic Control Devices 
Accelerated Rapidly/Stopped Suddenly 
Honking Horn 
Flashing Lights 
Obscene Gestures 
Obstructing The Path Of Others 
Other Aggressive Behavior 
Reasons For Aggressive Driving Behavior 

WrongTurnLane 120 
IllegalUTurn 120 
RanLights 121 
WrongWay 121 
OtherManeuver 122 
AggressionCount 122 
SpeedingBehavior 122 
TailgatingBehavior 123 
Weaving 123 
LightViolations 124 
RapidAcceleration 124 
Honking 124 
Flashing 125 
ObsceneGestures 125 
BlockingOthers 125 
OtherAggression 126 
AggressionReason 126 

DriverDrugs Data Set 

Variable Title Variable Name Page 

Drug Name DrugName 127 
Drug Type DrugType 127 
Driver Reported DriverReported 127 
Drug Test Results TestResult 128 

LTCCS Analytical User's Manual LTCCS Variable List • 22 


DriverHealth Data Set 

Variable Title Variable Name Page 

Corrected Vision Level 
Number Of Illness Factors 
Heart Attack 
Seizure (Epilepsy Related) 
Seizure (Other Source) 
Blackout (Diabetes Related) 
Blackout (Other Source) 
Severe Cold/Flu Symptoms 
Other Illness 
Normal Vision 
Legal Blindness 
Myopic (Near-sighted) Condition 
Hyperopic (Far-sighted) Condition 
Glaucoma 
Color Blind 
Astigmatism 
Other Vision Problem 
Unknown Vision Problem 
Number Of Other Physical Factors 
No Other Physical Factors 
Hearing Impairment 
Prosthesis 
Paraplegia 
Strenuous Recreation Activities 
Strenuous Non-Work Activities 
Sleep Apnea 
Other Physical Factor 

ADHCorrectedVision 129 
IllnessFactorCount 129 
HeartAttack 130 
EpilepticSeizure 130 
OtherSeizure 130 
DiabeticBlackout 131 
OtherBlackout 131 
ColdFlu 131 
OtherIllness 132 
NormalVision 132 
LegallyBlind 132 
Myopic 133 
Hyperopic 133 
Glaucoma 134 
ColorBlind 134 
Astigmatic 135 
OtherVision 135 
UnknownVision 135 
OtherFactorCount 136 
NoFactors 136 
HearingImpairment 137 
Prosthesis 137 
Paraplegia 137 
StrenuousRecreation 138 
StrenuousNonWork 138 
SleepApnea 139 
OtherFactorPhysical 139 

DriverRecognitionDistraction Data Set
Variable Title Variable Name Page


Inattention 

Conversation 

Nature Of Discussion 

Nature Of Relationship Between Driver And 
Person Conversing With 

Location Of Exterior Factor 

Inadequate Surveillance 

Tracking Of Rear Exterior Factor 

Other Recognition Factors 

Interior Distraction Count 

Looking At Movement/Actions Of Other 
Occupants 

Dialing/Hanging Up Phone 

Adjusting Radio/CD Player 

Adjusting Other Vehicle Controls 

Retrieving Object From Floor And/Or Seat 

Retrieving Object From Other Location 

Other Internal Distraction 

Exterior Distraction Count 

Looking At Previous Crash 

Looking At ApproachingTraffic 

Inattention 140 
Conversation 140 
Subject 141 

Conversant 141 
OutsideLocation 142 
ADDSurveillance 142 
Tracking 143 
ADDRecognition 143 
InteriorDistractionCount 143 

OccupantMovement 144 
ADDDialingPhone 144 
ADDAdjustingRadio 144 
OtherControls 145 
FloorRetrieval 145 
OtherRetrieval 145 
OtherInternal 146 
ExteriorDistractionCount 146 
ADDPreviousCrash 146 
ApproachingTraffic 147 

LTCCS Analytical User's Manual LTCCS Variable List • 23 


Looking For Street Address 
Looking At Outside Person 
Looking At Building 
Unspecified Outside Focus 
Other External Distraction 

StreetAddress 147 
ExternalPerson 147 
Building 148 
UnspecifiedExternal 148 
OtherExternal 148 

DriverSleep Data Set
Variable Title Variable Name Page


Hours Of Last Sleep 

Start Time Of Last Sleep Interval 

End Of Last Sleep Interval 

Hours Since Last Sleep 

If Hours Of Sleep Were Less Than 4 Hours, 
Hours Of Last Main Sleep 

Start Of Main Sleep Interval 

End Of Main Sleep Interval 

Hours Driving Since Last 8-Hour Break 

Hours On Duty Since Last 8-Hour Break 

LastSleepHours 149 
LastSleepStart 149 
LastSleepEnd 150 
HoursSinceSleep 150 

MainSleepHours 151 
MainSleepStart 151 
MainSleepEnd 151 
HoursDriving 152 
HoursOnDuty 152 

Longest Work Day In Preceding 7-Day Interval WeekLongest 153 
Shortest Work Day In Preceding 7-Day Interval WeekShortest 153 
Average Work Day In Preceding 7-Day Interval WeekAverage 153 

Did The Time At Which The Driver Began To 
Sleep Rotate/Shift In Last 7 Days? 

Hours Worked On Day Of Crash 

Longest Length Of Daily Sleep In Preceding 
7-Day Interval 

Shortest Length Of Daily Sleep In Preceding 
7-Day Interval 

Average Length Of Daily Sleep In Preceding 
7-Day Interval 

Total Hours Worked On Primary Job During 
Preceding 7-Day Interval 

Rotation 154 
HoursWorked 154 
ADSLongestDay 155 
ADSShortestDay 155 
AverageDay 156 
LastWeekHours 156 

Hours Worked On Second Job During Preceding 
7-Day Interval LastWeekMoonlight 

Environment Data Set 
Variable Title Variable Name Page 

Relation To Roadway 
Relation To Junction 
Interchange 
Trafficway Flow 
Trafficway Flow Restrictions 
Intersection Type 
Number Of Travel Lanes 
Access Control 
Route Signing 
Trafficway Functional Class 
Light Conditions 
Traffic Control Device 
Railroad Grade Crossing? 
Traffic Control Device Functioning 

RoadRelation 158 
Junction 158 
Interchange 159 
ENVTrafficFlow 159 
FlowRestriction 160 
IntersectionType 160 
TravelLanes 161 
AccessControl 161 
Signage 162 
FunctionalClass 162 
Daylight 163 
TrafficControl 163 
Railroad 164 
Functioning 164 

LTCCS Analytical User's Manual LTCCS Variable List • 24 


Roadway Class 
Roadway Alignment 
Roadway Profile 
Roadway Surface Type 
Roadway Surface Condition 
Roadway Surface Defect 
Roadway Design Deficiencies 
Shoulder Surface Type 
Shoulder Width 
Rumble Strip Type/Involvement 
Sight Line Restrictions? 
Sight Line Distance 
AASHTO Sight Distance 
No Adverse Conditions 
Rain 
Snow 
Fog 
Wind Gusts 
Hail 
Sleet 
Dust 
Other Atmospheric Conditions 

RoadwayClass 165 
RoadAlignment 165 
RoadProfile 166 
RoadSurface 166 
SurfaceCondition 166 
SurfaceDefect 167 
DesignDefect 167 
ShoulderType 168 
ShoulderWidth 168 
RumbleStrip 169 
SightLineRestriction 169 
SightLineDistance 169 
AASHToDistance 170 
ENVNoConditions 170 
ENVRain 170 
ENVSnow 171 
ENVFog 171 
ENVWindGusts 171 
ENVHail 172 
ENVSleet 172 
ENVDust 172 
ENVOtherConditions 173 

Events Data Set
Variable Title Variable Name Page


Stratum 

Class Of Vehicle (First Listing) 

General Area Of Damage (First Vehicle Listed) 

Object Contacted 

Class Of Vehicle (Second Listing) 

General Area Of Damage (Second Vehicle 
Listed) 

Stratum 174 
ClassVehicle 174 
DamageArea 175 
EVEObjectContact 176 
ClassVehicle2 178 

DamageArea2 179 

FactorAssessment Data Set
Variable Title Variable Name Page


No Traffic Flow Factors 
Previous Crash Nearby 
Construction Work Zone 
Emergency Vehicle Approaching 
Rush Hour Congestion 
Other Traffic Flow Interruption 
Other Traffic Flow Interruption – Specify 
Vehicle Defect Count 
View Obstruction – Related To Load 
View Obstruction – Related To Vehicle Design 
View Obstruction - Other 
Tire Malfunction 
Braking System Malfunction 
Transmission Malfunction 
Engine Problem 
Other Vehicle Condition 

NoTraffic 180 
AFTPreviousCrash 180 
ConstructionZone 181 
EmergencyVehicle 181 
RushHour 181 
OtherTraffic 182 
OtherTrafficSpecify 182 
VehicleDefectCount 183 
LoadObstructedView 183 
DesignedObstructedView 183 
OtherViewObstruction 184 
TireFailure 184 
BrakeFailure 184 
TransmissionFailure 185 
EngineProblem 185 
OtherDefect 186 

LTCCS Analytical User's Manual LTCCS Variable List • 25 


Other Vehicle Condition – Specify 
Tire Deficiency 
Brakes Out-Of-Adjustment 
Brakes Inoperative 
Brake System Deficiency 
Vehicle Overweight 
Vehicle Lighting Deficiency 
Cargo/Load Securement Related Problem 
Suspension/Frame Deficiency 
Towing Unit Problem 
Reflective Tape Missing/Obscured 
Fuel System Problem 
Exhaust Leak 
Steering Wheel Problem 
Median Width 
Radius Of Curvature 
Sight Distance 
AASHTO Recommended Sight Distance 
Roadway Factor Count 
Traffic Signs/Signals Missing 
Roadway View Obstruction 
View Obstructed By Other Vehicle 
Road Geometry 
Road Sight Distance Insufficient 
Lane Delineation Problem 
Narrow Shoulders 
Narrow Road 
Ramp Speed 
Roadway Condition 
Slick Surface 
Road Under Water 
Road Washed Out 
Other Roadway Related Factor 
Other Roadway Related Factor – Specify 
Weather Factors Count 
Rain 
Snow 
Fog 
Wind Gust 
Hail 
Sleet 
Other Weather Related Factor 
Other Weather Related Factor – Specify 
Environmental Factor Count 
Glare 
Blowing Debris 
Smoke 
No Driver Present 
Other Sudden Change In Ambience 

OtherDefectSpecify 186 
TireDeficiency 186 
BrakesOutOfAdjustment 186 
BrakesInoperative 187 
BrakesSystemDeficiency 187 
VehicleOverweight 188 
VehicleLightingDeficiency 188 
CargoLoadSecurement 188 
SuspensionFrameDeficiency 189 
TowingUnitProblem 189 
ReflectiveTapeMissingObscured 189 
FuelSystemProblem 190 
ExhaustLeak 190 
SteeringWheelProblem 191 
MedianWidth 191 
AFTCurveRadius 191 
SightDistance 192 
AASHTORecommended 192 
RoadwayFactorCount 192 
SignsMissing 193 
ObjectObscured 193 
VehicleObscured 194 
RoadGeometry 194 
InsufficientSight 194 
BadLaneMarkings 195 
NarrowShoulders 195 
NarrowRoad 195 
RampSpeed 196 
PoorCondition 196 
SlickSurface 197 
UnderWater 197 
WashedOut 197 
OtherProblem 198 
OtherProblemSpecify 198 
WeatherCount 198 
AFTRain 199 
AFTSnow 199 
AFTFog 200 
WindGust 200 
AFTHail 200 
AFTSleet 201 
OtherWeather 201 
OtherWeatherSpecify 201 
EnvironmentCount 202 
Glare 202 
BlowingDebris 202 
Smoke 203 
AFTNoDriver 203 
OtherChangeSpecify 203 

GeneralVehicle Data Set
Variable Title Variable Name Page


Vehicle Make GVEMake 204
Vehicle Model (listed with Vehicle Make) GVEModel (with GVEMake) 206


LTCCS Analytical User's Manual LTCCS Variable List • 26 


Vehicle Model Year 

Body Type 

Class Of Vehicle 

Curb Weight 

Source Of Curb Weight 

Cargo Weight 

Source Of Cargo Weight Information 

Vehicle Identification Number (VIN) 

Vehicle Special Use 

Inspection Type 

Date Of Inspection 

Injury Severity Code – Police 

Injury Severity Code – Researched 

VIN Make 

VIN Model 

VIN Year 

Series 

VIN Body Type 

Roof1 

Roof2 

Roof3 

Front Wheel Drive 

Four Wheel Drive 

Restraint Type 

Carburetion 

Fuel Type 

VIN Weight 

Vehicle Type 

Wheel Configuration 

Daytime Running Lights 

Base Weight 

Motorcycle Displacement 

Police Reported Travel Speed 

Posted Speed 

Is The Driver Present? 

Police Reported Alcohol Present? 

Alcohol Test For Driver 

Alcohol Test Result 

Time Between Crash And Alcohol Test 

Source Of Alcohol Test Results 

Police Reported Other Drug Presence? 

Driver’s Zip Code 

Race/Ethnic Origin Of Driver 

Commercial Motor Vehicle Crashes 

Commercial Motor Vehicle Violations 

Non-Commercial Motor Vehicle Crashes 

Non-Commercial Motor Vehicle Violations 

Total Crashes 

Total Violations 

Previous Violations 

Unknown Type Crashes 

MCMIS Crashes 

MCMIS Commercial Motor Vehicle Violations 

MCMIS Commercial Motor Vehicle 
Non-Violations 

GVEYear 232 
GVEBodyType 232 
GVEVehicleClass 234 
GVECurbWeight 235 
GVEWeightSource 235 
GVECargoWeight 236 
GVECargoSource 236 
GVEVIN 237 
GVESpecialUse 237 
GVEInspection 237 
GVEInspectionDate 238 
GVEPARSevCode 238 
GVERESSevCode 239 
VINMake 239 
VINModel 240 
VINYear 240 
Series 240 
VINBodyType 241 
Roof1 241 
Roof2 241 
Roof3 241 
FrontWheelDrive 242 
FourWheelDrive 242 
GVERestraintType 242 
Carburetion 242 
FuelType 243 
VINWeight 243 
VehicleType 243 
WheelConfig 244 
DayRunningLights 244 
BaseWeight 244 
GVEMotorcycleDisplacement 244 
GVETravelSpeed 245 
GVEPostedSpeed 245 
DriverPresent 245 
PARAlcoholPresent 246 
PARAlcoholTest 246 
PARAlcoholTestResult 246 
PARTestDelay 247 
PARTestSource 247 
PARDrugsPresent 248 
ZipCode 248 
EthnicOrigin 248 
CMVCrashes 249 
CMVViolations 249 
NonCMVCrashes 250 
NonCMVViolations 250 
TotalCrashes 250 
TotalViolations 251 
PrevViolations 251 
UnkTypeCrashes 251 
MCMIScrashes 252 
MCMIScmvViolations 252 

MCMIScmvNonViolations 252 

LTCCS Analytical User's Manual LTCCS Variable List • 27 


HazMat Data Set 

Variable Title Variable Name Page 

Hazardous Material
Reportable?
Hazardous Material Waiver?


Variable Title 

Material 253 
Reportable 254 
Waiver 254 

HazMatInsp Data Set 

Variable Name Page 

Hazardous Material Inspection
Inspection Exists?
Violation?
Out-Of-Service?
Disposition


Variable Title 

HMIInspection 255 
InspectionExists 255 
HMIViolation 256 
HMIOutOfService 256 
HMIDisposition 256 

Injuries Data Set 

Variable Name Page 

Occupant Injury Description 
AIS Code 
Aspect 
Injury Source Category 
Injury Source 
Intrusion Row 
Intrusion Location 
Crush Direction 
Crush Magnitude 
Component Intrusion 
Information Source 

Variable Title 

OINDescription 257 
AISCode 257 
Aspect 289 
InjurySourceCat 291 
InjurySource 292 
IntrusionRow 297 
IntrusionLocation 298 
CrushDirection 298 
CrushMagnitude 298 
Component 299 
InformationSource 300 

JackknifeAssessments Data Set 

Variable Name Page 

Type Of Jackknife Event 
Source Of Jackknife Impetus 
Vehicle Location At Start Of Jackknife 
Direction Of Rotation 
Jackknifed While Count 
Driving At Constant Velocity 
Traversing A Curve 
Completing A Turn 
Light Braking 
Accelerating 
Completing Avoidance Maneuver 
Other Jackknife Circumstance 
Throttle Input Only 
Moderate Braking 
Heavy Braking 
Traversing A Straight Section 

AJKType 301 
AJKSource 301 
AJKLocation 302 
AJKDirection 302 
WhileCount 302 
AJKConstant 303 
AJKCurve 303 
AJKTurn 303 
AJKLightBraking 304 
AJKAccelerating 304 
AJKAvoidance 304 
AJKOther 305 
AJKDecelerating 305 
AJKModerateBraking 305 
AJKHeavyBraking 306 
AJKStraight 306 

LTCCS Analytical User's Manual LTCCS Variable List • 28 


MCMISdriverData Data Set 

Variable Title Variable Name Page 

Number Of Crashes Crashes 307 
Number Of Inspections Inspections 307 
Driver Out-Of-Service Violations InspDriverOOS 308 
Vehicle Out-Of-Service Violations InspVehOOS 308 
Total Types Of Local Violations LocalViols 308 
Total Types Of Inspection Violations InspViols 309 

MCMISviolation Data Set 

Variable Title Variable Name Page 

Violation Code Code 310 
Violation Description ViolDesc 323 
Total Number Of Violations NumViols 323 
Number Of Out-Of-Service Violations NumOOSviols 324 

NonMotorists Data Set 

Variable Title Variable Name Page 

Nonmotorist’s Age 

Nonmotorist’s Height 

Nonmotorist’s Weight 

Nonmotorist’s Gender 

Nonmotorist Type 

Nonmotorist Attitude 

Nonmotorist’s Motion 

Nonmotorist’s Action Relative To Vehicle 

Nonmotorist’s Body (Chest) Orientation Relative 
To Striking Vehicle… 

Nonmotorist Sight Impairments 

Nonmotorist Sight Restrictions 

Nonmotorist Hearing Impairments 

Nonmotorist Hearing Restrictions 

Nonmotorist Distractions 

Nonmotorist Decision Errors 

Nonmotorist Risk-Taking Behavior 

Nonmotorist First Avoidance Action 

Nonmotorist Hand Use In Avoidance Action 

Injury Severity Code – Police 

Injury Severity Code – Researched 

ANMAge 325 
ANMHeight 325 
ANMWeight 325 
ANMGender 326 
ANMType 326 
ANMPosition 326 
Motion 327 
Action 328 

Orientation 328 
SightImpaired 329 
SightRestricted 329 
HearingImpaired 329 
HearingRestricted 330 
Distraction 330 
ANMDecision 331 
RiskTaking 331 
ANMAvoidance 332 
HandsUsed 332 
ANMPARSevCode 332 
ANMRESSevCode 333 

Occupants Data Set
Variable Title Variable Name Page


Occupant’s Age OCCAge 334
Occupant’s Height OCCHeight 334


LTCCS Analytical User's Manual LTCCS Variable List • 29 


Occupant’s Weight 

Occupant’s Sex 

Occupant’s Role 

Race/Ethnic Origin Of Occupant 

Occupant’s Eyewear 

Police Reported Air Bag Availability/Function 

Police Reported Belt Use 

Ejection Type 

Ejection Area 

Ejection Medium 

Medium Status 

Multi-Ejection? 

Entrapment 

Occupant Mobility 

Number Of Intrusions 

Occupant Location 

Occupant’s Posture 

Head Restraint Type At This Occupant’s 
Position 

Head Restraint Damage By Occupant At This 
Occupant Position 

Seat Type 

Seat Orientation 

Seat Track Position 

Seat Performance 

Does The Seat Have Integrated Passenger 
Belts? 

Seat Back Incline Prior To Impact 

Seat Back Incline Position Post Impact 

Child Safety Seat Used? 

Manual (Active) Belt System Availability 

Manual (Active) Belt System Used In This 
Crash? 

Proper Use Of Manual (Active) Belts 

Manual (Active) Belt Failure Modes During 
Crash 

Manual Shoulder Belt Upper Anchorage 
Adjustment 

Seat Belt Pretensioners Present 

Pretensioners Actuate? 

Pretensioner Travel 

Retractor Type 

Source Of Researcher’s Determination Of 
Manual Belt Use 

Automatic (Passive) Belt System 
Availability/Function 

Automatic (Passive) Belt System Use 

Automatic (Passive) Belt System Type 

OCCWeight 334 
OCCGender 335 
Role 335 
Race 335 
Eyewear 336 
AirbagAvail 336 
BeltUsed 337 
EjectionType 337 
EjectionArea 337 
Medium 338 
MediumStatus 338 
MultiEjection 339 
Entrapment 339 
Mobility 339 
Intrusions 340 
OCCLocation 340 
Posture 341 

OCCRestraintType 341 

RestraintDamage 342 
SeatType 342 
SeatOrientation 342 
TrackPosition 343 
SeatPerformance 343 

IntegratedRestraints 343 
PriorInclination 344 
PostInclination 344 
ChildSeatAvailable 345 
ManualBeltAvailable 345 

ManualBeltUsed 346 
ManualBeltProper 346 

ManualBeltFailure 347 

AnchorAdjustment 347 
PreTensionerAvailable 348 
PreTensionerActuated 348 
PreTensionerTravel 348 
Retractor 349 

ManualBeltSource 349 

AutoBeltAvailable 349 
AutoBeltUsed 350 
BeltMotorized 350 

Proper Use Of Automatic (Passive) Belt System AutoBeltProper 
Automatic (Passive) Belt Failure Modes During 

 Crash 

Source Of Researcher’s Determination Of 
Automatic Belt Use 

Injury Severity Code – Police 

Mortality 

Medical Treatment 

AutoBeltFailure 351 

AutoBeltSource 352 
OCCInjSeverityCode 352 
Mortality 352 
InitialTreatment 353 

LTCCS Analytical User's Manual LTCCS Variable List • 30 


Type Of Medical Facility (Initial Treatment) 
Hospital Stay 
Working Days Lost 
Death Date 
Death Time 
Number Of Injuries For This Occupant 
Glasgow Coma Scale (GCS) Score 
(At Medical Facility) 
Was The Occupant Given Blood? 
Arterial Blood Gases – ABG (HCO3) 

InitialFacility 353 
HospitalDays 354 
WorkDaysLost 354 
DateOfDeath 354 
TimeOfDeath 355 
InjuryCount 355 

GCSScore 355 
UnitsTransfused 356 
ABGTest 356 

Overview Data Set 

Variable Title Variable Name Page 

Vehicle Make OVEMake 358 
Vehicle Model (with Vehicle Make) OVEModel (with OVEMake) 360 
Vehicle Model Year OVEYear 386 
Truck Configuration OVEConfiguration 386 
Pre-Event Movement Movement 387 
Critical Precrash Event OVECriticalEvent 388 
Critical Reason For The Critical Precrash Event OVEReason 390 
Attempted Avoidance Maneuver OVEAvoidance 391 

Pre-Impact Stability 
Pre-Impact Location 
Right-Of-Way? 
Crash Configuration 
Crash Type 
Jackknife Occurrence 
Cargo Shift 
Alcohol Involvement 
Drug Involvement 
Driver Physical Factors 
Driver Fatigue 
Recognition Factors 
Decision Factors 
Aggression Factors 
Surveillance Factors 
Emotion/Experience Factors 
Carrier/Employer Factors 
Traffic Factors 
Vehicle Factors 
Roadway Factors 
Weather Factors 
Environmental Factors 
Speed/Distance Factors 
Nonmotorist Involvement 

Variable Title 

OVEStability 392 
OVELocation 392 
OVERightOfWay 393 
OVEAccidentType 393 
OVECrashCode 394 
OVEJackKnife 396 
OVECargoShift 397 
OVEAlcohol 397 
AnyDrugsVeh 397 
DriverPhysical 398 
DriverFatigue 398 
OVERecognition 399 
OVEDecision 399 
Aggression 399 
OVESurveillance 400 
EmotionExperience 400 
CarrierEmployer 401 
Traffic 401 
VehicleState 401 
Roadway 402 
Weather 402 
OVEenvironment 402 
OVESpeed 403 
NonMotorist 403 

PARViolations Data Set 

Variable Name Page 

Violations Charged As A Result Of This Crash PARViolationCode 404
Police Description Of Violation PARDescription 406


LTCCS Analytical User's Manual LTCCS Variable List • 31 


SaferAuthorityStatus Data Set 
Variable Title Variable Name Page


Common Status CommonStatus 407 
Contract Status ContractStatus 407 
Broker Status BrokerStatus 407 

SaferCarrier Data Set 
Variable Title Variable Name Page 

Carrier Status 
Authorized For-Hire 
Exempt For-Hire 
Private Property 
Private Passengers (Business) 
Private Passengers (Non-Business) 
Migrant 

U.S. Mail 
Federal Government 
State Government 
Local Government 
Indian Tribe 
Other 
Unknown 
Carrier Operation Description 
Cargo Carried 
Number Of Drivers 
Number Of Power Units 
Mileage Year 
Carrier-Reported Mileage 

Status 408 
AuthorizedForHire 408 
ExemptForHire 408 
PrivateProperty 409 
PrivatePassengersBusiness 409 
PrivatePassengersNonBusiness 409 
Migrant 410 
USMAIL 410 
FederalGovernment 410 
StateGovernment 411 
LocalGovernment 411 
IndianTribe 411 
Other 411 
Unknown 412 
CarrierOperationDescription 412 
CargoCarried 412 
CountDrivers 412 
CountPowerUnits 413 
MileageYear 413 
Mileage 413 

SaferCrashSummary Data Set 
Variable Title Variable Name Page


Crash Year 
Number Of Fatalities 
Number Of Injuries 
Number Of Towaways 

Variable Title 

SCSYear 414 
SCSFatalities 414 
SCSInjuries 414 
SCSTowaway 415 

SaferDriverCrashReport Data Set 

Variable Name Page 

Date Of Crash SCDDate 416 
Crash State SCDState 416 
Driver’s Date Of Birth SCDDateOfBirth 416 
Number Of Fatalities SCDFatalities 416 
Number Of Injuries SCDInjuries 417 
Towaway? SCDTowaway 417 
Hazardous Material? HazardousMaterial 417 

LTCCS Analytical User's Manual LTCCS Variable List • 32 


SaferDriverInspection Data Set
Variable Title Variable Name Page


Level Code 
Inspection Date 
Inspection State 
Driver Date Of Birth 
Total Number Of Violations 
Total Number Of Out-Of-Service Violations 
HazMat? 

LevelCode 424 
SDIDate 424 
SDIState 424 
SDIDriverDOB 424 
TotalViolations 425 
TotalOOS 425 
HazMat 425 

SaferDriverViolation Data Set 

Variable Title Variable Name Page 

Violation Type SDVViolation 426 
Unit Number UnitNumber 426 
Unit Type SDVUnitType 427 
Number Of Out-Of-Service Violations SDVOutOfService 427 

SaferInspectionsSummary Data Set 

Variable Title Variable Name Page 

Number Of Driver Inspections 

Number Of Driver Out-Of-Service Inspections 

Driver Out-Of-Service Percentage 

Average Number Of Driver Out-Of-Service 
Violations 

Number Of Vehicle Inspections 

Number Of Vehicle Out-Of-Service Inspections 

Vehicle Out-Of-Service Percentage 

Average Number Of Vehicle Out-Of Service 
Violations 

Number Of HazMat Inspections 

Number Of HazMat Out-Of-Service Inspections 

HazMat Out-Of-Service Percentage 

Average Number Of HazMat Out-Of-Service 
Violations 

Total Number Of Inspections 

DriverInspections 428 
DriverOutOfService 428 
DriverOutOfServicePerc 428 

DriverViolationsAverage 428 
VehicleInspections 429 
VehicleOutOfService 429 
VehicleOutOfServicePerc 429 

VehicleViolationsAverage 429 
HazMatInspections 430 
HazMatOutOfService 430 
HazMatOutOfServicePerc 430 

HazMatViolationsAverage 430 
SISTotal 431 

SaferInsurance Data Set
Variable Title Variable Name Page


Bodily Injury & Property Damage Insurance 
Required? 

Bodily Injury & Property Damage Insurance 
Status 

Cargo Insurance Required 

Cargo Insurance Status 

Bond Required 

Bond Status 

Minimum Coverage Amount 

Liability Insurance Amount 

BIPDRequired 432 

BIPDOK 432 
CargoRequired 432 
CargoOK 433 
BondRequired 433 
BondOK 433 
MinCoverageAmount 433 
LiabilityInsurance 434 

LTCCS Analytical User's Manual LTCCS Variable List • 33 


SaferReview Data Set 

Variable Title Variable Name Page 

Rating Date 
Safety Rating 
Review Date 
Review Type 

Variable Title 

RatingDate 435 
Rating 435 
ReviewDate 435 
ReviewType 435 

SafeStat Data Set 

Variable Name Page 

SafeStat Score Date
Overall SafeStat Score
Accident Safety Evaluation Area (SEA)
Driver Safety Evaluation Area (SEA)
Vehicle Safety Evaluation Area (SEA)
Safety Management Safety Evaluation Area 


STADate 437 
Score 437 
AccidentSEA 437 
DriverSEA 438 
VehicleSEA 438 

SafetySEA 438 
STACategory 438 
CategoryDescription 439 

(SEA) 
SafeStat Category 
Category Description 

Variable Title 

TruckExterior Data Set 
Variable Name Page 

Power Unit Type 
Cab Style 
Dromedary Box? 
Sleeper Berth? 
Were Blind Spots Related To Crash? 
Data Recorder Installed? 
Vehicle Speed 
Gear Position 
Total Number Of Trailers 
Total Empty Weight 
Total Cargo Weight 
Total GVWR 
Truck Configuration 
Total Length 
Placard Required? 
Mirror Count 
Right Door Mirror 
Left Door Mirror 
Right Fender Mirror 
Left Fender Mirror 
Other Location Mirror 
ITS Equipment Count 
Headway Detection Unit 
Side/Object Detection Unit 
Rollover Warning Unit 
Other ITS Equipment 

PowerUnitType 440 
CabStyle 440 
DromedaryBox 441 
SleeperBerth 441 
BlindSpot 441 
DataRecorder 442 
TEXSpeed 442 
GearPosition 443 
TrailerCount 443 
TEXEmptyWeight 444 
CMDBCargoWeight 444 
TOTALGVWR 444 
TEXConfiguration 445 
TEXTotalLength 445 
PlacardRequired 446 
MirrorCount 446 
RightDoorMirror 446 
LeftDoorMirror 447 
RightFenderMirror 447 
LeftFenderMirror 447 
OtherLocationMirror 448 
ITSCount 448 
ITSHeadway 448 
ITSSideObject 449 
ITSRollover 449 
ITSOther 450 

LTCCS Analytical User's Manual LTCCS Variable List • 34 


TruckInspection Data Set 

Variable Title Variable Name Page 

Unit Position 
Violation Code 
Violation Type 
Out Of Service Violation? 
Disposition Of Truck 

Variable Title 

TINPosition 451 
TINViolationCode 451 
ViolationType 464 
TINOutofService 465 
TINDisposition 465 

TruckUnits Data Set 

Variable Name Page 

Unit Position In Vehicle Configuration 

Unit Type In Vehicle Configuration 

Trailer Body Type 

Cargo Type 

Unit VIN 

Manufacture Date 

Empty Weight Of Unit 

Cargo Weight Of Unit 

GVWR 

Total Length Of Unit 

Percent Of Cargo Capacity 

Tank Capacity 

Tank Load 

Hazardous Cargo? 

Cargo Spillage 

Number Of Axles In Use 

Number Of Lift Axles (Not In Use) 

Number Of Steer Axles 

Retroflective Tape Condition On Rear 

Retroflective Tape Condition On Sides 

Retroflective Tape Used? 

Retroflective Tape Pattern 

Retroflective Tape Color 

Retroflective Tape Peeling/Damaged On Rear 
Underride Guard 

Retroflective Tape Peeling/Damaged On Other 
Rear Area 

Retroflective Tape Peeling/Damaged On Sides 

TUNPosition 466 
TUNUnitType 466 
TUNBodyType 467 
CargoType 467 
TUNVIN 468 
ManufactureDate 468 
TUNEmptyWeight 469 
TUNCargoWeight 469 
GVWR 470 
TUNTotalLength 470 
CapacityPercent 471 
TankCapacity 471 
TankLoad 471 
Hazard 472 
TUNSpillage 472 
AxlesUsed 473 
AxlesNotUsed 473 
SteerableAxles 473 
RearTapeCond 474 
SideTapeCond 474 
ReflectTapeType 474 
ReflectTapePattern 475 
ReflectTapeColor 475 

UnderrideTapePeel 476 

RearTapePeel 476 
SideTapePeel 476 

VehicleEvents Data Set
Variable Title Variable Name Page


Origin Of Fire 

Fire Occurrence 

Rollover Type 

Quarter Turns 

Rollover Initiation Type 

Rollover Initiation Location 

Rollover Initiation – Object Contacted 

Location On Vehicle Where Initial Principal 
Tripping Force Is Applied 

FireOrigin 478 
FireSeverity 478 
RolloverType 479 
QuarterTurns 479 
RollInitType 479 
RollInitLocation 480 
RollObject 480 

RollTrip 482 

LTCCS Analytical User's Manual LTCCS Variable List • 35 


Direction Of Initial Roll RollDirect 483 
Manner Of Collision CollisionManner 483 
First Harmful Event FirstHarmfulEvent 484 

VehicleExterior Data Set 

Variable Title Variable Name Page 

Body Category BodyCategory 486 
Is The Vehicle In Transport? InTransport 491 
Inspection Type InspectionType 491 
Type Of Transmission Transmission 492 
Drive Wheels DriveWheels 492 
Left Front Tire Restricted? LFRestricted 493 
Left Rear Tire Restricted? LRRestricted 493 
Right Rear Tire Restricted? RRRestricted 493 
Right Front Tire Restricted? RFRestricted 493 
Left Front Tire Deflated? LFDeflated 494 
Left Rear Tire Deflated? LRDeflated 494 
Right Rear Tire Deflated? RRDeflated 494 
Right Front Tire Deflated? RFDeflated 495 
Wheelbase Wheelbase 495 
Overall Length OverallLength 495 
Maximum Width MaxWidth 496 
Average Track Width AverageTrack 497 
Front Overhang FrontOverhang 497 
Rear Overhang RearOverhang 497 
Undeformed End Width EndWidth 498 
Researcher’s Assessment Of Vehicle 

 Disposition VehicleDisposition 498 
Justification For Researcher’s Assessment Of

 Vehicle Disposition Justification 498 
Multi-Stage Or Altered Vehicle? MultiStage 498 

LTCCS Analytical User's Manual LTCCS Variable List • 36 


Variable Definitions and Codes 
Variable definitions and attributes for all of the LTCCS data sets, including SAFER and MCMIS 
data sets, are provided here. This section is organized alphabetically by data set. Within each 
data set, the variables are ordered as they appear in the data sets. For each variable the 
following information is included (where applicable:) 

(Sample variable listing) 

Object Contacted Category 

Definition: This variable describes the category of object involved in a particular impact to a 
vehicle. 

(Source of the data to provide context and further background) 

Source: Researcher determined — primary sources are the scene and vehicle inspections; 
secondary sources include the police report and interviewees. 

(Cross Reference* information provides insight and possible alternatives) 

Cross Reference: Derived from CDCCrush.CDCObjectContact. 

Variable Name: ObjectContactClass 

Attribute Codes 
Code1 
Meaning 
Vehicle 
2 Noncollision 
3 
5 
6 
7 
Collision with Fixed Object 
Collision with Nonfixed Object 
Unknown event or object 
Other event (specify) 

*Explanation of terms used in Cross Reference entries: 


Identical – The variable is exactly the same as another variable. 
Related to – The variable depicts the same type of information. 
Congruent – The variable has what appears to be identical information, yet the source is different. 
Derived from – The variable depicts the same information as another variable, but this variable is 


not as detailed. 


Elaborates on – The variable depicts the same information as another variable, but this variable is 
more detailed. 
Computed from – The variable provides a count of attributes given by the following variables. 
When applicable – This is used when the number of records in the 2 data sets are not the same. 


All cross references are expressed in <TABLE>.<FIELD> format. 


LTCCS Analytical User's Manual Variable Definitions and Codes • 37 


Variable Definitions and Codes - Airbags Data Set 
Airbags Data Set 

The Airbags data set contains the variables CaseID, PSU, PSUStrat, RATWeight, VehicleNumber 
and AirbagNumber. AirbagNumber is assigned to each airbag in the vehicle. Each record is 
uniquely identified by CaseID, VehicleNumber and AirbagNumber. CaseID and VehicleNumber 
should be used to merge the Airbag data set with vehicle level data sets. CaseID, 
VehicleNumber and AIROccupantNumber should be used to merge the Airbag data set with the 
Occupant data set. This data set also contains the following variables: 

Cross Reference: This table is related to Occupants.AirbagAvail. 

Air Bag Occupant Number 

Definition: This variable represents the occupant associated with this air bag, identified by their 
occupant number. 

Source: Researcher determined — primary source is the vehicle inspection; secondary sources 
include the interview, repair facilities, tow facility, and medical records. 

Cross Reference: Related to Occupants.AirbagAvail, values will differ in part due to Police 
Report vs. Researcher determined values. 

Variable Name: AIROccupantNumber 

Attribute Codes 
Code* 
99 
Meaning 
Value 
Unknown 
Seat Row 1 

Definition: This variable is used to identify an air bag deployment that occurred in the first row of 
seats in the vehicle. 

Variable Name: SeatRow1 

Attribute Codes 
Code0-5 
9 
Meaning 
Seat row value 
Unknown 
Seat Location 1 

Definition: This variable is used to identify the seat location in the first row of the vehicle where 
an air bag deployment occurred. 

Variable Name: SeatLocation1 

Attribute Codes 
Code0-4 
9 
Meaning 
Seat row value 
Unknown 

LTCCS Analytical User's Manual Airbags Data Set • 38 


Variable Definitions and Codes - Airbags Data Set 

Seat Row 2 

Definition: This variable is used to identify an air bag deployment that occurred in the second 
row of seats in the vehicle. 

Variable Name: SeatRow2 

Attribute Codes 
Code0-5 
9 
Meaning 
Seat Row value 
Unknown 
Seat Location 2 

Definition: This variable is used to identify the seat location in the second row of the vehicle 
where an air bag deployment occurred. 

Variable Name: SeatLocation2 

Attribute Codes 
Code0-4 
9 
Meaning 
Seat Row value 
Unknown 

Deployment Location Of Air Bag 

Definition: This variable identifies the location of a particular air bag. 

Variable Name: AirbagLocation 

Attribute Codes 

Code Meaning 

1 Steering Wheel Hub 
2 Top Instrument Panel 
3 Mid Instrument Panel 
4 Bottom Instrument Panel 
5 Seat Back 
6 Door 
7 Roof Side Rail 
98 Other 
99 Unknown 

Air Bag Status 

Definition: This variable documents the availability of the air bag. 

Source: Researcher determined — primary source is the vehicle inspection; secondary sources 
include the interview, police report, and medical records. NOTE: The use of the police report is 
limited. If there is no vehicle inspection and the only secondary source is the PAR, then the PAR 

LTCCS Analytical User's Manual Airbags Data Set • 39 


Variable Definitions and Codes - Airbags Data Set 

must clearly indicate that the vehicle is airbag equipped and/or deployed either in the "narrative" 
or "restraint system" block. 

Variable Name: AirbagStatus 

Attribute Codes 
Code Meaning 
1 Airbag Available 
2 Airbag disconnected (specify) 
3 Airbag not reinstalled 
9 Unknown if airbag available for this crash 
Type Of Air Bag 

Definition: This variable describes the type of air bag present. 

Source: Researcher determined — primary source is the interview, secondary sources may 
include the repair facility and/or documents found in the vehicle. 

Variable Name: AirbagType 

Attribute Codes 

Code Meaning 

1 Orig. man. installed sys. 
2 Retrofitted Air Bag 
3 Replacement Air Bag 
4 Unknown Type 
8 Not applicable 
9 Unknown 

Redesigned Air Bag 

Definition: This variable indicates whether or not the vehicle was equipped with a redesigned air 
bag for this location. Redesigned air bags include second-generation air bags, next-generation air 
bags, Air Bag II, advanced air bags, and other innovative systems that have been developed to 
make use of air bag protection technology. 

Source: Researcher determined — primary source is the vehicle inspection; secondary sources 
include VIN and interview. 

Variable Name: Depowered 

Attribute Codes 

Code Meaning 

0 Not Redesigned 
1 Redesigned 
2 Advanced (specify) 
70 No air bag available for this crash 
99 Unknown 

LTCCS Analytical User's Manual Airbags Data Set • 40 


Variable Definitions and Codes - Airbags Data Set 

Air Bag Deployment 

Definition: This variable describes when in the crash sequence the air bag deployed. 

Source: Researcher determined — primary source is the vehicle inspection; secondary sources 
include the interview, repair facilities, tow facility, police report, and medical records. NOTE: The 
use of the police report is limited. If there is no vehicle inspection and the only secondary source 
is the PAR, then the PAR must clearly indicate that an air bag deployed either in the "narrative" or 
in a "restraint system" block. 

Variable Name: Deployment 

Attribute Codes 

Code Meaning 

1 Deployed during crash (as a result of impact) 

2 Deployed, inadvertently just prior to crash 

3 Deployed, details unknown 

4 Deployed as a result of a non-collision event during accident sequence (e.g. 

fire, explosion, electrical) 

7 Not deployed 

70 No airbag functional for this crash 

99 Unknown if deployed 

Indications Of Air Bag Failure? 

Definition: This variable documents whether or not something abnormal has occurred to the air 
bag system. It may not necessarily mean that the air bag system was defective. 

Source: Researcher determined — primary source is the vehicle inspection; secondary sources 
include the interview, repair facilities, tow facility, police report, and medical records. NOTE: The 
use of all secondary sources is limited. If there is no vehicle inspection, then the secondary 
sources are limited to the reporting of "no failure". If the only secondary source is the PAR and no 
failure is alleged, then the PAR must clearly indicate that an air bag deployed either in the 
"narrative" or in a "restraint system" block. 

Variable Name: AirbagFailure 

Attribute Codes 

Code Meaning 

0 No 
1 Yes (specify) 
70 Airbag not available 
79 Unknown if available 
99 Unknown 


Type Of Cutoff Switch 

Definition: This variable describes the type of air bag cutoff switch present in the vehicle. 

Source: Researcher determined — primary source is the vehicle inspection; secondary sources 
may include the police report, repair facilities, and tow facility. 

Variable Name: SwitchType 

LTCCS Analytical User's Manual Airbags Data Set • 41 


Variable Definitions and Codes - Airbags Data Set 
Attribute Codes 

Code Meaning 
0 None present 
1 Originally equipped 
2 Retro fit 
3 Switch present, type unknown 
9 Unknown if switch present 

Cutoff Switch Position Status 

Definition: This variable describes the status of the airbag cutoff switch at the time of the crash. 

Source: Researcher determined — primary source is the vehicle inspection; secondary sources 
may include the police report, repair facilities, and tow facility. 

Variable Name: SwitchStatus 

Attribute Codes 
Code0 
1 
Meaning 
Switch On/Automatic 
Switch off 
7 
8 
9 
None present 
Unknown if switch present 
Switch status unknown 

Did Air Bag Module Cover Flaps Open At Designated Tear Points? 

Definition: This variable documents whether or not the air bag properly opened at its tear points. 
A designated tear point is a weakened area of the flap material designed to allow the air bag easy 
escape from its storage area during deployment. Some air bags in the seat cushion and seat 
back may not have cover flaps, but will deploy through a seam that separates during the air bag 
deployment. 

Source: Researcher determined — primary source is the vehicle inspection, secondary source is 
the interview 

Variable Name: FlapsOpen 

Attribute Codes 

Code Meaning 

0 No 
1 Yes 
60 Not deployed 
69 Unknown if deployed 
70 No airbag available for this crash 
79 Unknown 
99 Unknown if flaps/seams opened at tear points 

LTCCS Analytical User's Manual Airbags Data Set • 42 


Variable Definitions and Codes - Airbags Data Set 

Were The Cover Flaps Damaged? 

Definition: This variable indicates whether or not the air bag cover flaps sustained damage 
during deployment. Normal separation/tearing at the designated tear points does not constitute 
damage. 

Source: Researcher determined — primary source is vehicle inspection; secondary source is the 
interview. 

Variable Name: FlapsDamaged 

Attribute Codes 
Code Meaning 
0 No 
1 Yes (specify) 
60 Not deployed 
69 Unknown if deployed 
70 No airbag available for this crash 
99 Unknown if airbag module cover flaps opened at tear points 

Was There Damage To The Air Bag? 

Definition: This variable documents any damage to the air bag during the crash sequence. 

Source: Researcher determined — primary source is the vehicle inspection; secondary source 
may include the interview. 

Variable Name: AirbagDamage 

Attribute Codes 

Code Meaning 

0 Not Damaged 
1 Ruptured 
2 Cut 
3 Torn 
4 Punctured 
5 Burned 
6 Abraded 
60 Not deployed 
69 Unknown if deployed 
70 No airbag available for this crash 
88 Other damage (specify) 
95 Damaged, details unknown 
99 Deployed, unknown if damaged 

Source Of Air Bag Damage 

Definition: This variable documents the source of damage to the air bag during the crash 
sequence. This variable is related to the variable “Was There Damage To The Air Bag?” 

Source: Researcher determined — primary source is the vehicle inspection; secondary source 
includes the interview. 

LTCCS Analytical User's Manual Airbags Data Set • 43 


Variable Definitions and Codes - Airbags Data Set 
Variable Name: DamageSource 

Attribute Codes 
Code Meaning 
1 Object worn by occupant (specify) 
2 Object carried by occupant (specify) 
3 Adaptive/assistive controls (specify) 
4 Cover flaps 
5 Fire in vehicle 
6 Thermal burns 
7 Windshield 
8 Rescue or emergency efforts 
50 Not Damaged 
59 Deployed, unknown if damaged 
60 Not deployed 
69 Unknown if deployed 
70 No airbag available for this crash 
88 Other damage source (specify) 
99 Damaged, unknown source 

Had The Vehicle Been In Previous Crashes? 

Definition: This variable documents whether the vehicle had been in any previous crashes (that 
may or may not have involved air bag deployment). 

Source: Researcher determined — primary source is the interview, secondary source may 
include a repair facility. 

Variable Name: PriorCrashes 

Attribute Codes 
Code Meaning 
1 No previous crashes 
2 Previous crash(es) without deployment(s) 
3 One previous crash with deployment 
4 More than one previous crash with at least one deployment 
8 Previous crashes, unknown deployment status 
9 Unknown 

Had Any Prior Maintenance/Service Been Performed On Air Bag System? 

Definition: This variable indicates whether or not the air bag had received any maintenance or 
service work prior to the crash. 

Source: Researcher determined — primary source is the interview, secondary sources may 
include repair facilities and or documents found in the vehicle. 

Variable Name: PriorMaintenance 

LTCCS Analytical User's Manual Airbags Data Set • 44 


Variable Definitions and Codes - Airbags Data Set 

Attribute Codes 

Code Meaning 

0 No 
1 Yes (specify) 
9 Unknown 


CDC For Air Bag Deployment Impact 

Definition: This variable indicates the CDC’s delta V rating for the impact associated with this air 
bag’s deployment. 

Source: Researcher determined — primary sources are the scene and vehicle inspection; 
secondary sources are the police report and the interviewee. 

Variable Name: CDC 

Attribute Codes 

Code Meaning 

1 Highest Delta V 
2 Second Highest Delta V 
3 Other delta V (specify) 
9 Unknown 
60 Not deployed 
69 Unknown if deployed 
70 No airbag available for this crash 
99 Deployed, unknown event 


Was The Air Bag In This Occupant’s Position Contacted By Another Occupant? 

Definition: This variable documents whether another occupant (besides the intended occupant) 
contacted this particular air bag. 

Variable Name: ContactOther 

Attribute Codes 

Code Meaning 

0 No 
1 Yes (specify) 
60 Not deployed 
69 Unknown if deployed 
70 Airbag not functional (disconnected or not reinstalled) 
79 Unknown 
99 Deployed, unknown if other occupant contact to airbag 


LTCCS Analytical User's Manual Airbags Data Set • 45 


Variable Definitions and Codes - Brakes Data Set 

Brakes Data Set 

The Brakes data set contains the variables CaseID, PSU, PSUStrat, RATWeight, and 
VehicleNumber. CaseID, VehicleNumber, and Axle uniquely identify each record in this data set. 
CaseID and VehicleNumber should be used to merge the Brakes data set with vehicle level data 
sets. This data set also contains the following variables: 

Axle 

Definition: This variable identifies the axle to which the brake information is related. 

Source: Researcher determined — primary source is vehicle inspection, secondary sources 
include FMCSA Truck Inspector and/or Level 1 inspection report. 

Variable Name: Axle 

Attribute Codes 
Code1-15 
99 
Meaning 
Value 
Unknown 
Brake Type 

Definition: This variable documents the type of brake system present at a particular axle. 

Source: Researcher determined — primary source is vehicle inspection, secondary sources 
include FMCSA Truck Inspector and/or Level 1 inspection report. 

Variable Name: BrakeType 
Attribute Codes 
Code Meaning 

1 Air 
2 Hydraulic 
3 Electric 
9 Unknown 

Brake Axle Position 

Definition: This variable identifies on which unit of the truck configuration a particular axle is 
located. 

Source: Researcher determined — primary source is vehicle inspection, secondary sources 
include FMCSA Truck Inspector and/or Level 1 inspection report. 

Variable Name: BRAPosition 

Attribute Codes 
Code Meaning 
1-4 Number of Unit where axle is located 
9 Unknown 

LTCCS Analytical User's Manual Brakes Data Set • 46 


Variable Definitions and Codes - Brakes Data Set 

ABS Installed? 

Definition: This variable indicates whether or not ABS is available at a particular axle. 

Source: Researcher determined — primary source is vehicle inspection, secondary sources 
include FMCSA Truck Inspector and/or Level 1 inspection report. 

Variable Name: ABSInstalled 

Attribute Codes 
Code0 
1 
99 
Meaning 
No 
Yes 
Unknown 
ABS Functional? 

Definition: This variable indicates whether or not the ABS is functioning properly at a particular 
axle. 

Source: Researcher determined — primary source is vehicle inspection, secondary sources 
include FMCSA Truck Inspector and/or Level 1 inspection report. 

Variable Name: ABSFunctional 

Attribute Codes 
Code0 
1 
99 
Meaning 
No 
Yes 
Unknown 
Adjustor Type 

Definition: This variable indicates the type of brake adjustment system that is present at a 
particular axle. 

Source: Researcher determined — primary source is vehicle inspection, secondary sources 
include FMCSA Truck Inspector and/or Level 1 inspection report. 

Variable Name: AdjustorType 
Attribute Codes 
Code Meaning 

1 Man 
2 Auto 
99 Unknown 

Chamber Size 

Definition: This variable documents the size of the brake chamber for the braking system at a 
particular axle. 

LTCCS Analytical User's Manual Brakes Data Set • 47 


Variable Definitions and Codes - Brakes Data Set 

Source: Researcher determined — primary source is vehicle inspection, secondary sources 
include FMCSA Truck Inspector and/or Level 1 inspection report. 

Variable Name: ChamberSize 

Attribute Codes 

Code Meaning 

0.00-1000.00 Size in cm 
8887 Not applicable 
9994 Not Examined 
9999 Unknown 


Chamber Type 

Definition: This variable documents the type of chamber for a braking system at a particular 
axle. 

Source: Researcher determined — primary source is vehicle inspection, secondary sources 
include FMCSA Truck Inspector and/or Level 1 inspection report. 

Variable Name: ChamberType 

Attribute Codes 

Code Meaning 

1 A 6-15/16 1-3/8 
2 B 9-3/16 1-3/4 
3 C 8-1/16 1-3/4 
4 D 5-1/4 1-1/4 
5 E 6-3/16 1-3/8 
6 F 11 2-1/4 
7 G 9-7/8 2 
8 C-6 4-1/2 1-1/4 
9 C-9 5-1/4 1-3/8 
10 C-12 5-11/16 1-3/8 
11 C-16 6-3/8 1-3/4 
12 C-20 6-25/32 1-3/4 
13 C-24 7-7/32 1-3/4 
14 C-30 8-3/32 2 
15 C-36 9 2-1/4 
16 D-30 8-1/8 2-1/4 
17 DISC NA 
18 ELEC NA 
19 HYDR NA 
20 L-16 6-3/8 2.0 
21 L-20 6-25/32 2.0 
22 L-24 7-7/32 2.0 
23 L-24* 7-7/32 2.5 
24 L-30 8-3/32 2.5 
25 MM 8-1/8 2-1/4 
26 R-9 4-9/32 1-1/2 
27 R-12 4-13/16 1-1/2 


LTCCS Analytical User's Manual Brakes Data Set • 48 


Variable Definitions and Codes - Brakes Data Set 

28 R-16 5-13/32 2 
29 R-20 5-15/16 2 
30 R-24 6-13/32 2 
31 R-30 7-1/16 2-1/4 
32 R-36 7-5/8 2-3/4 
33 R-50 8-7/8 3 
34 WEDG 5/16 5/16 
88 Not applicable 
99 Unknown 


Stroke Type 

Definition: This variable indicates whether a particular chamber type is categorized as long or 
short. 

Source: Researcher determined — primary source is vehicle inspection, secondary sources 
include FMCSA Truck Inspector and/or Level 1 inspection report. 

Variable Name: StrokeType 

Attribute Codes 

Code Meaning 

1 Long 
2 Short 
3 Not Examined 
9 Unknown 


Left Length 

Definition: This variable documents the length of the left brake chamber at a particular axle. 
This value is measured and provided by the FMCSA Truck Inspector. 

Source: Researcher determined — primary source is the Level 1 inspection report. 

Variable Name: LeftLength 

Attribute Codes 

Code Meaning 

0.00-100.00 Size in cm 
8887 Not applicable 
9992 Inoperable 
9994 Not examined 
9999 Unknown 


Right Length 

Definition: This variable documents the length of the right brake chamber at a particular axle. 
This value is measured and provided by the FMCSA Truck Inspector. 

Source: Researcher determined — primary source is the Level 1 inspection report. 

Variable Name: RightLength 

LTCCS Analytical User's Manual Brakes Data Set • 49 


Variable Definitions and Codes - Brakes Data Set 

Attribute Codes 
Code0.00 - 100.00 
Meaning 
Size in cm 
8887 
9992 
9994 
Not applicable 
Inoperable 
Not examined 
9999 Unknown 

LTCCS Analytical User's Manual Brakes Data Set • 50 


Variable Definitions and Codes - CargoShiftAssessments Data Set 

CargoShiftAssessments Data Set 

The CargoShiftAssessments data set contains the variables CaseID, PSU, PSUStrat, 
RATWeight, and VehicleNumber. CaseID and VehicleNumber uniquely identify each record in 
this data set and should be used to merge the CargoShiftAssessments data set with other vehicle 
level data sets. This data set also contains the following variables: 

Source: All variables in this table are determined by Case Reviewer using all available 
information inputs. Primary sources include the scaled schematic, police report, driver interviews, 
witness interviews, and vehicle inspection results. Input from the truck inspection staff can also be 
utilized to code this variable. 

Type Of Cargo Shift Event 

Definition: This variable documents the occurrence of a precrash cargo shift and the type of 
freight that shifted. The cargo shift must occur prior to any impact event. 

Cross Reference: Elaborates on CrashAssessment.ACRCargoShift. Elaborates on 
Overview.OVECargoShift. 

Variable Name: ACSType 

Attribute Codes 

Code Meaning 

0 No pre-crash cargo shift 
1 Boxed general freight (solids) 
2 Bulk freight (containerized) 
3 Bulk freight (not containerized) 
4 Large objects (solids) 
5 Tank – solids 
6 Tank – liquids 
77 Not applicable 
88 Other (specify) 
99 Unknown 


Vehicle Location At Start Of Cargo Shift 

Definition: This variable establishes the vehicle location at the start of the cargo shift sequence. 

Cross Reference: Congruent with IntvwDrCargoShift.IDGLocation, values will differ due to 
Interview vs. Researcher determined values. 

Variable Name: ACSLocation 

Attribute Codes 

Code Meaning 

0 No pre-crash event 
1 On roadway 
2 On shoulder 
3 On roadside 
4 On median 
7 Not applicable 
9 Unknown 


LTCCS Analytical User's Manual CargoShiftAssessments Data Set • 51 


Variable Definitions and Codes - CargoShiftAssessments Data Set 

Movement Count 

Definition: This variable documents the number of circumstances that were identified in which 
the cargo shift event occurred. This variable refers to the movements of the vehicle prior to the 
cargo shift. 

Cross Reference: Computed from the following variables in the CargoShiftAssessments data 
set: ACSConstant, ACSCurve, ACSTurn, ACSLightBraking, ACSAccelerating, ACSAvoidance, 
OtherMovement, ACSDecelerating, ACSModerateBraking, ACSHeavyBraking, ACSStraight. 

Variable Name: MovementCount 

Attribute Codes 
Code0-13 
88 
99 
Meaning 
Value counter 
No Driver 
Unknown 
Cause Count 

Definition: This variable documents the number of circumstances associated with a cargo shift 
that were coded for this vehicle. This variable refers to the possible causes of the cargo shift. 

Cross Reference: Computed from the following variables in the CargoShiftAssessments data 
set: ImproperGeneralLoading, ImproperBulkLoading, SparseTieDowns, WeakTieDowns, 
OtherSolids, Sloshing, BaffleFailure, CompartmentFailure, TankFailure, OtherLiquids, 
OtherCargos, UnknownCause. 

Variable Name: CauseCount 

Attribute Codes 
Code0-13 
88 
99 
Meaning 
Value counter 
No Driver 
Unknown 

Precrash Cargo Spillage? 

Definition: This variable establishes the occurrence of cargo spillage during the precrash phase. 

Cross Reference: Congruent with IntvwDrCargoShift.IDGSpillage, values will differ due to 
Interview vs. Researcher determined values. 

Variable Name: ACSSpillage 

Attribute Codes 

Code Meaning 

0 No pre-crash cargo shift 
1 Yes (specify) 
2 No 
7 Not applicable 
9 Unknown 

LTCCS Analytical User's Manual CargoShiftAssessments Data Set • 52 


Variable Definitions and Codes - CargoShiftAssessments Data Set 

Driving At Constant Velocity 

Definition: This variable establishes whether or not the driver is attempting to maintain a 
constant velocity at the time that the cargo begins to shift. (This variable was originally an 
attribute choice under the variable “Circumstances In Which Event Occurred.”) 

Cross Reference: Congruent with IntvwDrCargoShift.IDGDrivingConstantVelocity, values will 
differ due to Interview vs. Researcher determined values. 

Variable Name: ACSConstant 

Attribute Codes 
Code0 
1 
Meaning 
Absent 
Present 

Traversing A Curve 

Definition: This variable establishes whether or not the driver is traversing a curve at the time 
that the cargo begins to shift. (This variable was originally an attribute choice under the variable 
“Circumstances In Which Event Occurred.”) 

Cross Reference: Congruent with IntvwDrCargoShift.IDGTraversingCurve, values will differ due 
to Interview vs. Researcher determined values. 

Variable Name: ACSCurve 

Attribute Codes 

Code Meaning 

0 Absent 
1 Present 

Completing Turn 

Definition: This variable establishes whether or not the driver is attempting to turn at the time 
that the cargo begins to shift. (This variable was originally an attribute choice under the variable 
“Circumstances In Which Event Occurred.”) 

Cross Reference: Congruent with IntvwDrCargoShift.IDGCompletingTurn, values will differ due 
to Interview vs. Researcher determined values. 

Variable Name: ACSTurn 

Attribute Codes 

Code Meaning 

0 Absent 
1 Present 

Light Braking 

Definition: This variable establishes whether or not the driver is decelerating using light braking 
effort at the time that the cargo begins to shift. While the term “light braking” is a subjective 
evaluation, it generally implies that the level of braking is less than the level typically associated 

LTCCS Analytical User's Manual CargoShiftAssessments Data Set • 53 


Variable Definitions and Codes - CargoShiftAssessments Data Set 

with a normal traffic stop. (This variable was originally an attribute choice under the variable 
“Circumstances In Which Event Occurred.”) 

Cross Reference: Congruent with IntvwDrCargoShift.IDGLightBraking, values will differ due to 
Interview vs. Researcher determined values. 

Variable Name: ACSLightBraking 

Attribute Codes 
Code0 
1 
Meaning 
Absent 
Present 
Accelerating 

Definition: This variable establishes whether or not the driver is accelerating at the time that the 
cargo begins to shift. (This variable was originally an attribute choice under the variable 
“Circumstances In Which Event Occurred.”) 

Cross Reference: Congruent with IntvwDrCargoShift.IDGAccelerating, values will differ due to 
Interview vs. Researcher determined values. 

Variable Name: ACSAccelerating 
Attribute Codes 

Code Meaning 

0 Absent 
1 Present 

Completing Avoidance Maneuver 

Definition: This variable establishes whether or not the driver initiates a precrash avoidance 
maneuver at or prior to the time that the cargo begins to shift. (This variable was originally an 
attribute choice under the variable “Circumstances In Which Event Occurred.”) 

Cross Reference: Congruent with IntvwDrCargoShift.IDGCompletingAvoidance, values will 
differ due to Interview vs. Researcher determined values. 

Variable Name: ACSAvoidance 
Attribute Codes 

Code Meaning 

0 Absent 
1 Present 

Other Event Circumstance 

Definition: This variable establishes whether or not the driver/vehicle action or velocity is not 
described by the other cargo shift occurrence variables. (This variable was originally an attribute 
choice under the variable “Circumstances In Which Event Occurred” and was the “Other 
(specify):” attribute choice.) 

LTCCS Analytical User's Manual CargoShiftAssessments Data Set • 54 


Variable Definitions and Codes - CargoShiftAssessments Data Set 

Cross Reference: Congruent with IntvwDrCargoShift.IDGOtherSpecify, values will differ due to 
Interview vs. Researcher determined values. 

Variable Name: OtherMovement 

Attribute Codes 
Code0 
1 
Meaning 
Absent 
Present 

Throttle Input Only 

Definition: This variable establishes whether or not the driver is decelerating and decelerates 
solely by reducing throttle input at the time that the cargo begins to shift. (This variable was 
originally an attribute choice under the variable “Circumstances In Which Event Occurred.”) 

Cross Reference: Congruent with IntvwDrCargoShift.IDGDecelerating, values will differ due to 
Interview vs. Researcher determined values. 

Variable Name: ACSDecelerating 

Attribute Codes 

Code Meaning 

0 Absent 
1 Present 

Moderate Braking 

Definition: This variable establishes whether or not the driver is decelerating using a moderate 
level of braking effort at the time that the cargo begins to shift. A moderate level of braking effort 
generally implies that the level of braking effort is similar to the level typically associated with a 
normal traffic stop. (This variable was originally an attribute choice under the variable 
“Circumstances In Which Event Occurred.”) 

Cross Reference: Congruent with IntvwDrCargoShift.IDGModerateBraking, values will differ due 
to Interview vs. Researcher determined values. 

Variable Name: ACSModerateBraking 

Attribute Codes 

Code Meaning 

0 Absent 
1 Present 

Heavy Braking 

Definition: This variable establishes whether or not the driver is decelerating using a heavy level 
of braking effort (e.g. panic stop) at the time that the cargo begins to shift. The vehicle will 
typically experience wheel “lock-up” in this circumstance; however, wheel lock is not a 
requirement for using this designation. (This variable was originally an attribute choice under the 
variable “Circumstances In Which Event Occurred.”) 

LTCCS Analytical User's Manual CargoShiftAssessments Data Set • 55 


Variable Definitions and Codes - CargoShiftAssessments Data Set 

Cross Reference: Congruent with IntvwDrCargoShift.IDGHeavyBraking, values will differ due to 
Interview vs. Researcher determined values. 

Variable Name: ACSHeavyBraking 

Attribute Codes 
Code0 
1 
Meaning 
Absent 
Present 

Traversing A Straight Section 

Definition: This variable establishes whether or not the driver is traversing a straight roadway 
segment at the time that the cargo begins to shift. (This variable was originally an attribute choice 
under the variable “Circumstances In Which Event Occurred.”) 

Cross Reference: Congruent with IntvwDrCargoShift.IDGTraversingStraightSection, values will 
differ due to Interview vs. Researcher determined values. 

Variable Name: ACSStraight 

Attribute Codes 

Code Meaning 

0 Absent 
1 Present 

Improper Loading (General Freight) 

Definition: This variable establishes whether or not the cargo shift is associated with improper 
loading of general freight cargo. Usually, the cargo is not properly balanced during the loading 
process (e.g. large boxes on top of small boxes, inappropriate gaps between cargo units, etc.). 
This element is also used when the freight is not properly distributed over the length of the cargo 
area. (This variable was originally an attribute choice under the variable “Cargo Shift Associated 
With.”) 

Cross Reference: Congruent with IntvwDrCargoShift.SolidImproperLoadGeneral, values will 
differ due to Interview vs. Researcher determined values. 

Variable Name: ImproperGeneralLoading 

Attribute Codes 

Code Meaning 

0 Absent 
1 Present 

Improper Loading (Bulk Freight) 

Definition: This variable establishes whether or not the cargo shift is associated with improper 
loading of bulk freight cargo. Usually, the cargo consists of one or several large items that are not 
properly balanced. (This variable was originally an attribute choice under the variable “Cargo Shift 
Associated With.”) 

LTCCS Analytical User's Manual CargoShiftAssessments Data Set • 56 


Variable Definitions and Codes - CargoShiftAssessments Data Set 

Cross Reference: Congruent with IntvwDrCargoShift.SolidImproperLoadBulk, values will differ 
due to Interview vs. Researcher determined values. 

Variable Name: ImproperBulkLoading 

Attribute Codes 
Code0 
1 
Meaning 
Absent 
Present 

Inadequate Securement (Number Of Tie Downs) 

Definition: This variable establishes whether or not the cargo shift is associated with an 
inadequate number of tie downs used. This circumstance is most typically associated with bulk 
freight items. (This variable was originally an attribute choice under the variable “Cargo Shift 
Associated With.”) 

Cross Reference: Congruent with IntvwDrCargoShift.SolidInadeqSecureNumber, values will 
differ due to Interview vs. Researcher determined values. 

Variable Name: SparseTieDowns 

Attribute Codes 

Code Meaning 

0 Absent 
1 Present 

Inadequate Securement (Strength Of Tie Downs) 

Definition: This variable establishes whether or not the cargo shift is associated with inadequate 
strength of the tie downs that are used. This circumstance is most typically associated with bulk 
freight items. (This variable was originally an attribute choice under the variable “Cargo Shift 
Associated With.”) 

Cross Reference: Congruent with IntvwDrCargoShift.SolidInadeqSecureStrength, values will 
differ due to Interview vs. Researcher determined values. 

Variable Name: WeakTieDowns 

Attribute Codes 

Code Meaning 

0 Absent 
1 Present 

Other Source Of Solids Shift 

Definition: This variable establishes whether or not the cargo shift (solid freight) is associated 
with a specific factor that is not covered under the loading or securement variables. (This variable 
was originally an attribute choice under the variable “Cargo Shift Associated With.”) 

Cross Reference: Congruent with IntvwDrCargoShift.SolidOther, values will differ due to 
Interview vs. Researcher determined values. 

LTCCS Analytical User's Manual CargoShiftAssessments Data Set • 57 


Variable Definitions and Codes - CargoShiftAssessments Data Set 
Variable Name: OtherSolids 

Attribute Codes 
Code0 
1 
Meaning 
Absent 
Present 

Less Than Full Load (Slosh) 

Definition: This variable establishes whether or not the cargo shift (liquids) is associated with 
liquid slosh due to the truck carrying less than a full load. This affects vehicle stability. (This 
variable was originally an attribute choice under the variable “Cargo Shift Associated With.”) 

Cross Reference: Congruent with IntvwDrCargoShift.LiquidLessLoad, values will differ due to 
Interview vs. Researcher determined values. 

Variable Name: Sloshing 
Attribute Codes 

Code Meaning 

0 Absent 
1 Present 

Baffle Failure 

Definition: This variable establishes whether or not the cargo shift (liquids) is associated with a 
baffle failure that affects vehicle stability. (This variable was originally an attribute choice under 
the variable “Cargo Shift Associated With.”) 

Cross Reference: Congruent with IntvwDrCargoShift.LiquidBaffleFailure, values will differ due to 
Interview vs. Researcher determined values. 

Variable Name: BaffleFailure 

Attribute Codes 
Code0 
1 
Meaning 
Absent 
Present 

Compartment Partition Failure 

Definition: This variable establishes whether or not the cargo shift (liquids) is associated with a 
failure of a partition for at least one of the vehicle’s compartments. This failure subsequently 
affects vehicle stability. (This variable was originally an attribute choice under the variable “Cargo 
Shift Associated With.”) 

Cross Reference: Congruent with IntvwDrCargoShift.LiquidCompartmentFailure, values will 
differ due to Interview vs. Researcher determined values. 

Variable Name: CompartmentFailure 

LTCCS Analytical User's Manual CargoShiftAssessments Data Set • 58 


Variable Definitions and Codes - CargoShiftAssessments Data Set 
Attribute Codes 

Code0 
1 
Meaning 
Absent 
Present 
Tank Failure 

Definition: This variable establishes whether or not the cargo shift (liquids) is associated with a 
tank failure (e.g. seam failure). The failure may or may not affect vehicle stability. (This variable 
was originally an attribute choice under the variable “Cargo Shift Associated With.”) 

Cross Reference: Congruent with IntvwDrCargoShift.LiquidTankFailure, values will differ due to 
Interview vs. Researcher determined values. 

Variable Name: TankFailure 

Attribute Codes 
Code0 
1 
Meaning 
Absent 
Present 

Other Source Of Liquid Shift 

Definition: This variable establishes whether or not the cargo shift (liquid freight) is associated 
with a specific factor that is not covered under the other liquid cargo shift variables. (This variable 
was originally an attribute choice under the variable “Cargo Shift Associated With.”) 

Cross Reference: Congruent with IntvwDrCargoShift.LiquidOther, values will differ due to 
Interview vs. Researcher determined values. 

Variable Name: OtherLiquids 
Attribute Codes 

Code Meaning 

0 Absent 
1 Present 

Other Cargo Shift Types 

Definition: This variable establishes whether or not the cargo type is neither solid nor liquid (e.g. 
grains, bulk powders, etc.) and the vehicle experiences a cargo shift. (This variable was originally 
an attribute choice under the variable “Cargo Shift Associated With.”) 

Cross Reference: Congruent with IntvwDrCargoShift.OtherCargoType, values will differ due to 
Interview vs. Researcher determined values. 

Variable Name: OtherCargos 
Attribute Codes 

Code Meaning 

0 Absent 
1 Present 

LTCCS Analytical User's Manual CargoShiftAssessments Data Set • 59 


Variable Definitions and Codes - CargoShiftAssessments Data Set 

Unknown Cause Of Cargo Shift 

Definition: This variable establishes whether or not there is insufficient information to determine 
if a cargo shift occurred. (This variable was originally an attribute choice under the variable 
“Cargo Shift Associated With.”) 

Cross Reference: Congruent with IntvwDrCargoShift.UnknownAssoc, values will differ due to 
Interview vs. Researcher determined values. 

Variable Name: UnknownCause 

Attribute Codes 
Code0 
1 
Meaning 
Absent 
Present 

LTCCS Analytical User's Manual CargoShiftAssessments Data Set • 60 


Variable Definitions and Codes - CDCCrush Data Set 

CDCCrush Data Set 

The CDCCrush data set contains the variables CaseID, PSU, PSUStrat, RATWeight, 
VehicleNumber, EventNumber and ImpactNumber. EventNumber identifies a particular event in 
a sequence in the accident. ImpactNumber identifies each particular impact in the crush profile 
for a vehicle. CaseID, VehicleNumber, EventNumber and ImpactNumber uniquely identify each 
record in this data set. (Each record can also be uniquely identified by CaseID, VehicleNumber, 
EventNumber and PositionNumber.) CaseID and EventNumber should be used to merge the 
CDCCrush data set with the Events data set. CaseID and VehicleNumber should be used to 
merge the CDCCrush data set with vehicle level data sets. CaseID, VehicleNumber and 
PositionNumber should be used to merge the CDCCrush data set with the TruckUnits data set. 
This data set also contains the following variables: 

Position Number 

Definition: This variable identifies the unit number on the vehicle associated with a CDC/TDC. 
For example, a truck-trailer’s power unit would be Position Number “1,” and the first trailer would 
be Position Number “2.” A passenger vehicle would be assigned Position Number “1.” 

Source: Researcher determined – primary source is the vehicle inspection; secondary sources 
include on-scene vehicle photographs. 

Variable Name: PositionNumber 
Attribute Codes 

Code Meaning 

* Value 
Deformation Classification Type 

Definition: This variable indicates whether the deformation classification is related to a car or a 
truck. 

Source: Researcher determined – primary source is the vehicle inspection; secondary sources 
include on-scene vehicle photographs. 

Variable Name: DCType 

Attribute Codes 
CodeC 
T 
Meaning 
Car 
Truck 

Object Contacted Category 

Definition: This variable describes the category of object involved in a particular impact to a 
vehicle. 

Source: Researcher determined — primary sources are the scene and vehicle inspections; 
secondary sources include the police report and interviewees. 

Cross Reference: Derived from CDCCrush.CDCObjectContact. 

LTCCS Analytical User's Manual CDCCrush Data Set • 61 


Variable Definitions and Codes - CDCCrush Data Set 

Variable Name: ObjectContactClass 

Attribute Codes 
Code1 
Meaning 
Vehicle 
2 Noncollision 
3 
5 
6 
7 
Collision with Fixed Object 
Collision with Nonfixed Object 
Unknown event or object 
Other event (specify) 

CDC Object Contacted 

Definition: This variable identifies the object that was contacted for this event/impact. 

Source: Researcher determined. 

Cross Reference: Related to VehicleEvents.FirstHarmfulEvent, if CDCCrush.EventNumber = 1. 

Variable Name: CDCObjectContact 

Attribute Codes 
Code Meaning 

Vehicle#1 
Vehicle#2 
Vehicle#3 
Vehicle#4 
Vehicle#5 
Vehicle#6 
Vehicle#7 
Vehicle#8 
Vehicle#9 
Vehicle#10 
Vehicle#11 
Vehicle#12 
Vehicle#13 
Vehicle#14 
Vehicle#15 
Vehicle#16 
Vehicle#17 
Vehicle#18 
Vehicle#19 
Vehicle#20 
Vehicle#21 
Vehicle#22 
Vehicle#23 
Vehicle#24 
Vehicle#25 
Vehicle#26 
Vehicle#27 

LTCCS Analytical User's Manual CDCCrush Data Set • 62 


Variable Definitions and Codes - CDCCrush Data Set 

28 Vehicle#28 
29 Vehicle#29 
30 Vehicle#30 
31 Overturn->rollover (excludes end-over-end) 
32 Rollover->end-over-end 
33 Fire or explosion 
34 Jackknife 
35 Other intraunit damage (specify) 
36 Noncollision injury 
38 Other noncollision (specify) 
39 Noncollision->details unknown 
41 Tree (<= 10 cm in diameter) 
42 Tree (> 10 cm in diameter) 
43 Shrubbery or bush 
44 Embankment 
45 Breakaway pole or post (any diameter) 
50 Nonbreakaway pole or post (<=10cm in diameter) 
51 Nonbreakaway pole or post (>10 cm but <= 30 cm in diameter) 
52 Nonbreakaway pole or post (>30 cm in diameter) 
53 Nonbreakaway pole or post (diameter unknown) 
54 Concrete traffic barrier 
55 Impact attenuator 
56 Other traffic barrier (includes guardrail) (specify) 
57 Fence 
58 Wall 
59 Building 
60 Ditch or culvert 
61 Ground 
62 Fire hydrant 
63 Curb 
64 Brid