Large Truck Crash Causation Study Codebook June 2006 US Department of Transportation TABLE OF CONTENTS Introduction .....................................................................................................................................1 Case selection and sampling weights..............................................................................................1 Structure of data files.......................................................................................................................2 Sources of Data ...............................................................................................................................3 Documentation provided by codebook.............................................................................................4 Airbags Data Set.................................................................................................................5 Brakes Data Set................................................................................................................12 CargoShiftAssessments Data Set.....................................................................................18 CDCCrush Data Set..........................................................................................................26 Crash Data Set..................................................................................................................40 CrashAssessment Data Set..............................................................................................49 CrashDiscussion Data Set................................................................................................58 DMVViolation Data Set .....................................................................................................59 DriverAssessment Data Set..............................................................................................66 DriverDecisionAggression Data Set..................................................................................84 DriverDrugs Data Set........................................................................................................94 DriverHealth Data Set.......................................................................................................96 DriverRecognitionDistraction Data Set ...........................................................................104 DriverSleep Data Set ......................................................................................................112 Environment Data Set.....................................................................................................125 Events Data Set..............................................................................................................138 FactorAssessment Data Set...........................................................................................144 GeneralVehicle Data Set ................................................................................................164 HazMat Data Set.............................................................................................................196 HazMatinsp Data Set......................................................................................................198 Injuries Data Set..............................................................................................................200 JackknifeAssessments Data Set.....................................................................................209 MCMISdriverData Data Set ............................................................................................214 MCMISviolation Data Set................................................................................................218 NonMotorists Data Set....................................................................................................221 Occupants Data Set........................................................................................................230 Overview Data Set..........................................................................................................256 PARViolations Data Set..................................................................................................272 SaferAuthorityStatus Data Set........................................................................................275 SaferCarrier Data Set......................................................................................................276 SaferCrashSummary Data Set .......................................................................................284 SaferDriverCrashReport Data Set ..................................................................................287 SaferDriverInspection Data Set ......................................................................................297 SaferDriverViolation Data Set.........................................................................................303 SaferInspectionsSummary Data Set...............................................................................305 SaferInsurance Data Set.................................................................................................314 SaferReview Data Set.....................................................................................................317 SafeStat Data Set ...........................................................................................................320 TruckExterior Data Set....................................................................................................326 TruckInspection Data Set................................................................................................337 TruckUnits Data Set........................................................................................................339 VehicleEvents Data Set..................................................................................................354 LTCCS Codebook • June2006 Table of Contents • i VehicleExterior Data Set.................................................................................................360 Generalized Estimated Sampling Errors......................................................................................375 Index............................................................................................................................................379 LTCCS Codebook • June2006 Table of Contents • ii Introduction This report documents the September 30, 2005, version of the Large Truck Crash Causation Study (LTCCS) data set. 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 report summarizes all the information in each of the 43 data files that comprise the LTCCS data set. Case selection and sampling weights 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. Data were collected on crashes from 2001 through 2003. Crashes were sampled for the LTCCS in two stages. The sampling structure used the existing structure of NHTSA’s National Automotive Sampling System Crashworthiness Data System (NASS CDS). That is, cases were sampled from sites that are part of the NASS CDS system. The first stage of sampling is the selection of primary sampling units (PSUs), which are geographic areas. The PSUs were sampled from 12 “strata,” which were larger geographic areas classified by four geographic regions (northeast, midwest, south, and west) and three categories of population density (central city, large county, and group of counties). Two PSUs were sampled from each of the 12 strata, to make 24 sampling sites. The second stage of sampling is to select crashes occurring within each sampled PSU. Crashes were eligible for sampling if they met the following two criteria: 1. The crash involved at least one large truck, defined as a truck with a gross vehicle weight rating (GVWR) of 10,001 pounds or more. 2. The crash involved at least one fatality, incapacitating, or non-incapacitating but evident injury. Injuries were classified using the KABCOU injury severity scale. Table 1 shows the available levels. In that scale, crashes eligible for sampling included a “K,” “A,” or “B” injury. Table 1 KABCOU Injury Scale Code Definition K Fatal injury A Incapacitating Injury B Non-Incapacitating Injury C Possible Injury O No Injury U Unknown In each data file, the variables PSU and PSUStrata identify the PSU and PSU selection stratum respectively, and the variable RATWeight contains the correct case weight to produce nationally representative estimates. The Large Truck Crash Causation Study Analytical Users Manual provides a complete description of the sample design and calculation of sampling weights. The data files provided here include both cases with valid, nonzero weights and cases with zero weights. The cases with zero weights either are from the pilot phase of the project or are cases that were sampled but later found to not meet the selection criteria. They are included for clinical analysis or as anecdotal data. They should not be included in estimates of nationally-representative results. In most software systems that support the use of a weighting variable, these cases will be dropped from a weighted (nationally-representative) analysis since the weight variable, RATWeight, is set to zero for the nonsample cases. LTCCS Codebook Introduction • 1 Structure of data files The LTCCS data is supplied in 43 data sets. The data were originally collected using a complex relational data system, and then formatted into analysis data sets which preserve many aspects of the original relational design. Table 2 identifies the data files, the level at which the data in each file were collected, and the variable names that can be used to uniquely identify a record in each data file. The “level” at which the data are recorded simply corresponds to the entity each record in the particular data file pertains to. Some files have one record per crash, one record per vehicle, or one record per driver. Other data files contain information at a more detailed level and may have multiple records per vehicle. For example, the Brakes data file includes one record for each axle on the truck combination. Since truck combinations sampled for the LTCCS included up to 11 axles, some trucks have eleven records in the Brakes file. Table 2 LTCCS Data Files Data set name # records # records with nonzero weights Level Unique record identifier AIRBAGS 857 797 Airbag CaseID, VehicleNumber, AirbagNumber BRAKES 5,283 4,798 Brake CaseID, VehicleNumber, and Axle CRASH 1,070 963 Crash CaseID DRIVERDRUGS 1,458 1,330 Drug CaseID, VehicleNumber and DrugName EVENTS 2,777 2,535 Event CaseID and EventSequence HAZMAT 57 51 Hazardous material CaseID, VehicleNumber and Material HAZMATINSP 4,107 3,517 Hazardous material inspection CaseID, VehicleNumber and HMIInspection CDCCRUSH 3,973 3,630 Impact CaseID, VehicleNumber, EventNumber and ImpactNumber or CaseID, VehicleNumber, EventNumber and PositionNumber INJURIES 8,937 8,295 Injury CaseID, VehicleNumber, OccupantNumber, and InjuryNumber SAFERDRIVERINSPECTION 795 778 Inspection CaseID, VehicleNumber, and SDIDate NONMOTORISTS 53 41 Nonmotorist CaseID and NonMotoristNumber OCCUPANTS 3,014 2,761 Occupant CaseID, VehicleNumber and OccupantNumber VEHICLEEXTERIOR 921 838 Passenger vehicle CaseID and VehicleNumber SAFERDRIVERCRASH-REPORT 215 213 Previous crash CaseID, VehicleNumber, and SCDDate SAFERREVIEW 1,581 1,480 Review CaseID, VehicleNumber and ReviewDate TRUCKEXTERIOR 1,241 1,123 Truck CaseID and VehicleNumber TRUCKUNITS 2,179 1,972 Truck unit CaseID, VehicleNumber and TUNPosition CARGOSHIFTASSESSMENTS 2,284 2,078 Vehicle CaseID and VehicleNumber CRASHASSESSMENT 2,284 2,078 Vehicle CaseID and VehicleNumber CRASHDISCUSSION 2,284 2,078 Vehicle CaseID and VehicleNumber ENVIRONMENT 2,284 2,078 Vehicle CaseID and VehicleNumber FACTORASSESSMENT 2,284 2,078 Vehicle CaseID and VehicleNumber GENERALVEHICLE 2,284 2,078 Vehicle CaseID and VehicleNumber JACKKNIFEASSESSMENTS 2,284 2,078 Vehicle CaseID and VehicleNumber OVERVIEW 2,284 2,078 Vehicle CaseID and VehicleNumber LTCCS Codebook Introduction • 2 Data set name # records # records with nonzero weights Level Unique record identifier VEHICLEEVENTS 2,284 2,078 Vehicle CaseID and VehicleNumber DRIVERASSESSMENT 2,284 2,078 Vehicle/Driver CaseID and VehicleNumber DRIVERDECISION-AGGRESSION 2,284 2,078 Vehicle/Driver CaseID and VehicleNumber DRIVERHEALTH 2,284 2,078 Vehicle/Driver CaseID and VehicleNumber DRIVERRECOGNITION- DISTRACTION 2,284 2,078 Vehicle/Driver CaseID and VehicleNumber DRIVERSLEEP 2,284 2,078 Vehicle/Driver CaseID and VehicleNumber MCMISDRIVERDATA 1,016 927 Vehicle/Driver CaseID and VehicleNumber SAFERAUTHORITYSTATUS 605 560 Vehicle/Driver CaseID and VehicleNumber SAFERCARRIER 796 742 Vehicle/Driver CaseID and VehicleNumber SAFERINSPECTIONS-SUMMARY 796 742 Vehicle/Driver CaseID and VehicleNumber SAFERINSURANCE 605 560 Vehicle/Driver CaseID and VehicleNumber SAFESTAT 1,882 1,787 Vehicle/Driver CaseID and VehicleNumber DMVVIOLATION 4,712 4,277 Violation CaseID, VehicleNumber, and ViolationNumber MCMISVIOLATION 4,309 3,907 Violation CaseID, VehicleNumber and Code PARVIOLATIONS 1,945 1,816 Violation CaseID, VehicleNumber and PARViolationCode SAFERDRIVERVIOLATION 643 643 Violation CaseID and VehicleNumber* TRUCKINSPECTION 3,241 3,008 Violation CaseID, VehicleNumber, TINPosition and TINViolationCode SAFERCRASHSUMMARY 2,784 2,596 Year CaseID, VehicleNumber and SCSYear * One record per violation but no unique record identifier. The identifier variables can be used to link the data sets together to permit analyses that use information from more than one data set. A unique CaseID variable is assigned to each crash. Within each crash, each vehicle is assigned a unique value, stored in the VehicleNumber variable. A unique OccupantNumber is assigned to each occupant of a specific vehicle. Thus, the combination of CaseID, VehicleNumber, and OccupantNumber uniquely identifies a specific individual. To link information on drivers in the DriverAssessment file to vehicle characteristics in the GeneralVehicle file, one would join records that match on CaseID and VehicleNumber. Sources of Data The information in most of the data files was collected by NHTSA researchers and State truck inspectors at the crash scene and in subsequent investigation and assessment. Data in some of the data files was linked in from administrative data sets. Data in two data sets, MCMISDriverData and MCMISDriverViolation were linked in from the Motor Carrier Management Information System (MCMIS) Crash and MCMIS Inspection files, respectively. The MCMIS Crash file contains records of crashes reported by the States. All crashes must be reported that include either a truck with a GVWR over 10,000 pounds or a gross combination weight rating over 10,000 pounds, or a bus designed to transport more than eight people including the driver, or a vehicle displaying a hazardous materials placard, and the crash includes either a fatality, a person injured and transported for immediate medical attention, or a vehicle towed due to disabling damage. All such crashes must be reported by the States to the MCMIS Crash file, though it is known that during the data collection phase of the LTCCS, a significant number of qualifying crashes were not reported. The MCMIS Inspection file includes records of all vehicle inspections conducted by FMCSA, including roadside inspections, compliance reviews, and other inspections. LTCCS Codebook Introduction • 3 Data in ten data sets, all of which are named with the prefix SAFER-, are linked in from the FMCSA’s Safety and Fitness Electronic Records System database. The SAFER system is used to evaluate the fitness of motor carriers subject to FMCSA regulation and contains information on the carrier’s fitness status, historical information on previous crashes, inspections, violations, and previous safety reviews of the carrier. The data files contain only records of cases that could be matched to records in the SAFER system. Information about prior crashes and violations can also be found in the GeneralVehicle data file and the DMVViolation data file. Documentation provided by codebook This codebook provides a complete listing of every variable and every code level in each data file (except for the record identifier variables that are repeated in each data file). For each variable in a data file, the codebook provides the distribution of records, the code values stored in the data file, the label associated with each code value, the data storage type, the storage length of the variable, and the format entry, if any. The codebook documents all records in the file. The records are not weighted but are raw counts of the number of records. The data files include both the pilot and nonsample records, which have a zero for the RATWeight variable, and case records, which have a valid RATWeight greater than zero. Figure 1 Codebook Listing Example Figure 1 provides an example of an entry for the BrakeType variable in the Brakes data file. 1. The name of the variable in the SAS file. 2. The name of the format associated with the variable. This format is stored in the FORMATS.SASB7CAT file that is supplied along with the SAS data files. Not all variables have associated formats in the FORMATS.SASB7CAT file. 3. The storage type of the variable. Data are stored either as Numeric or Char (character) data. 4. The storage length in bytes for the variable. Storage of numeric variables range in length from three to eight bytes. Character variable storage lengths vary between one and 21,000, which is used to store the researcher’s case narrative in the CrashDiscussion data file. 5. The frequency distribution (N) and percentage distribution (Prcnt) of the code levels recorded for each variable. 6. The code value stored in the data file. This is the actual value stored. In the case of Char variables that do not have an associated format, the codebook shows asterisks (*) for the code that is stored, and the stored character string is shown as the Label. 7. The label for each code value. LTCCS Codebook Introduction • 4 Codebook - Airbags Data Set Airbags Data Set 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 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 Airbags data set with the Occupant data set. Format Type Length Variable Name BEST8 Numeric 8 AirbagNumber Definition: Identifies the number of the airbag in the vehicle. N Prcnt Code Label 586 68.4 1 1 227 26.5 2 2 23 2.7 3 3 14 1.6 4 4 2 0.2 5 5 2 0.2 6 6 1 0.1 7 7 1 0.1 8 8 1 0.1 9 9 Format Type Length Variable Name OT54F Numeric 8 OccupantNumber Definition: Represents the occupant associated with this air bag, identified by their occupant number. N Prcnt Code Label 648 75.6 1 1 133 15.5 2 2 76 8.9 99 Unknown Format Type Length Variable Name OT60F Numeric 8 SeatRow1 Definition: Identifies an air bag deployment that occurred in the first row of seats in the vehicle. N Prcnt Code Label 855 99.8 1 First row 2 0.2 9 Unknown LTCCS Codebook Airbags Data Set • 5 Codebook - Airbags Data Set Variable Name Format Type Length SeatLocation1 OT61F Numeric 8 Definition: Identifies the seat location in the first row of the vehicle where an air bag deployment occurred. N Prcnt Code Label 648 75.6 1 First location 207 24.2 3 Third location 2 0.2 9 Unknown Variable Name Format Type Length OT60F Numeric 8 SeatRow2 Definition: Identifies an air bag deployment that occurred in the second row of seats in the vehicle. N Prcnt Code Label 6 0.7 1 First row 851 99.3 9 Unknown Variable Name Format Type Length OT61F Numeric 8 SeatLocation2 Definition: Identifies the seat location in the second row of the vehicle where an air bag deployment occurred. N Prcnt Code Label 5 0.6 1 First location 1 0.1 3 Third location 851 99.3 9 Unknown Variable Name Format Type Length ML92F Numeric 8 AirbagLocation Definition: Identifies the location of a particular air bag. N Prcnt Code Label 578 67.4 1 Steering Wheel Hub 116 13.5 2 Top Instrument Panel 74 8.6 3 Mid Instrument Panel 2 0.2 4 Bottom Instrument Panel 33 3.9 5 Seat Back 9 1.1 6 Door 5 0.6 7 Roof Side Rail 1 0.1 98 Other 39 4.6 99 Unknown LTCCS Codebook Airbags Data Set • 6 Codebook - Airbags Data Set Variable Name Format Type Length AirbagStatus ML91F Numeric 8 Definition: Documents the availability of the air bag. N Prcnt Code Label 782 91.2 1 Airbag Available 1 0.1 3 Airbag not reinstalled 74 8.6 9 Unknown if airbag available for this crash Variable Name Format Type Length ML211F Numeric 8 AirbagType Definition: Describes the type of air bag present. N Prcnt Code Label 311 36.3 1 Orig. man. installed sys. 2 0.2 3 Replacement Air Bag 520 60.7 4 Unknown Type 1 0.1 8 No air bag available 23 2.7 9 Unknown Variable Name Format Type Length ML291F Numeric 8 Depowered Definition: 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. N Prcnt Code Label 373 43.5 0 Not Redesigned 381 44.5 1 Redesigned 24 2.8 2 Advanced (specify) 1 0.1 70 No air bag available for this crash 78 9.1 99 Unknown Format Type Length Variable Name ML212F Numeric 8 Deployment Definition: Describes when in the crash sequence the air bag deployed. N Prcnt Code Label 383 44.7 1 Deployed during crash (as a result of impact) 4 0.5 3 Deployed, details unknown LTCCS Codebook Airbags Data Set • 7 Codebook - Airbags Data Set N Prcnt Code Label 2 0.2 4 Deployed as a result of a non-collision event during accident 425 49.6 7 Not deployed 1 0.1 70 No airbag functional for this crash 42 4.9 99 Unknown if deployed Variable Name Format Type Length ML160F Numeric 8 AirbagFailure Definition: 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. N Prcnt Code Label 746 87.0 0 No 7 0.8 1 Yes (specify) 1 0.1 70 Airbag not available 9 1.1 79 Unknown if available 94 11.0 99 Unknown Variable Name Format Type Length ML489F Numeric 8 SwitchType Definition: Describes the type of air bag cutoff switch present in the vehicle. N Prcnt Code Label 766 89.4 0 None present 14 1.6 1 Originally equipped 1 0.1 3 Switch present, type unknown 76 8.9 9 Unknown if switch present Variable Name Format Type Length ML490F Numeric 8 SwitchStatus Definition: Describes the status of the airbag cutoff switch at the time of the crash. N Prcnt Code Label 12 1.4 0 Switch On/Automatic 766 89.4 7 None present 51 6.0 8 Unknown if switch present 28 3.3 9 Switch status unknown LTCCS Codebook Airbags Data Set • 8 Codebook - Airbags Data Set Format Type Length Variable Name ML164F Numeric 8 FlapsOpen Definition: 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. N Prcnt Code Label 5 0.6 0 No 322 37.6 1 Yes 419 48.9 60 Not deployed 10 1.2 69 Unknown if deployed 1 0.1 70 No airbag available for this crash 10 1.2 79 Unknown 90 10.5 99 Unknown if flaps/seams opened at tear points Variable Name Format Type Length ML163F Numeric 8 FlapsDamaged Definition: 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. N Prcnt Code Label 316 36.9 0 No 6 0.7 1 Yes (specify) 419 48.9 60 Not deployed 10 1.2 69 Unknown if deployed 1 0.1 70 No airbag available for this crash 105 12.3 99 Unknown if airbag module cover flaps opened at tear points Variable Name Format Type Length ML158F Numeric 8 AirbagDamage Definition: Documents any damage to the air bag during the crash sequence. N Prcnt Code Label 295 34.4 0 Not Damaged 1 0.1 1 Ruptured 4 0.5 2 Cut 9 1.1 3 Torn 1 0.1 4 Punctured 4 0.5 5 Burned 2 0.2 6 Abraded 419 48.9 60 Not deployed LTCCS Codebook Airbags Data Set • 9 Codebook - Airbags Data Set N Prcnt Code Label 17 2.0 69 Unknown if deployed 1 0.1 70 No airbag available for this crash 2 0.2 88 Other damage (specify) 1 0.1 95 Damaged, details unknown 101 11.8 99 Deployed, unknown if damaged Format Type Length Variable Name ML223F Numeric 8 DamageSource Definition: 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?” N Prcnt Code Label 3 0.4 5 Fire in vehicle 1 0.1 6 Thermal burns 8 0.9 7 Windshield 3 0.4 8 Rescue or emergency efforts 295 34.4 50 Not Damaged 65 7.6 59 Deployed, unknown if damaged 419 48.9 60 Not deployed 17 2.0 69 Unknown if deployed 1 0.1 70 No airbag available for this crash 2 0.2 88 Other damage source (specify) 43 5.0 99 Damaged, unknown source Format Type Length Variable Name ML215F Numeric 8 PriorCrashes Definition: Documents whether the vehicle had been in any previous crashes (that may or may not have involved air bag deployment). N Prcnt Code Label 148 17.3 1 No previous crashes 6 0.7 2 Previous crash(es) without deployment(s) 1 0.1 3 One previous crash with deployment 3 0.4 8 Previous crashes, unknown deployment status 699 81.6 9 Unknown LTCCS Codebook Airbags Data Set • 10 Codebook - Airbags Data Set Variable Name Format Type Length PriorMaintenance ML165F Numeric 8 Definition: Indicates whether or not the air bag had received any maintenance or service work prior to the crash. N Prcnt Code Label 138 16.1 0 No 719 83.9 9 Unknown Variable Name Format Type Length ML162F Numeric 8 CDC Definition: Indicates the CDC’s delta V rating for the impact associated with this air bag’s deployment. N Prcnt Code Label 270 31.5 1 Highest Delta V 41 4.8 2 Second Highest Delta V 1 0.1 3 Other delta V (specify) 5 0.6 9 Unknown 413 48.2 60 Not deployed 17 2.0 69 Unknown if deployed 1 0.1 70 No airbag available for this crash 109 12.7 99 Deployed, unknown event Variable Name Format Type Length ML214F Numeric 8 ContactOther Definition: Documents whether another occupant (besides the intended occupant) contacted this particular air bag. N Prcnt Code Label 336 39.2 0 No 4 0.5 1 Yes (specify) 419 48.9 60 Not deployed 10 1.2 69 Unknown if deployed 1 0.1 70 Airbag not functional (disconnected or not reinstalled) 15 1.8 79 Unknown 72 8.4 99 Deployed, unknown if other occupant contact to airbag LTCCS Codebook Airbags Data Set • 11 Codebook - Brakes Data Set Brakes Data Set 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 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. Format Type Length Variable Name BEST8 Numeric 8 Axle Definition: Identifies the axle to which the brake information is related. N Prcnt Code Label 1,186 22.4 1 1 1,186 22.4 2 2 1,032 19.5 3 3 891 16.9 4 4 791 15.0 5 5 87 1.6 6 6 49 0.9 7 7 30 0.6 8 8 15 0.3 9 9 8 0.2 10 10 8 0.2 11 11 Variable Name Format Type Length ML538F Numeric 8 BrakeType Definition: Documents the type of brake system present at a particular axle. N Prcnt Code Label 4,910 92.9 1 Air 205 3.9 2 Hydraulic 40 0.8 3 Electric 128 2.4 9 Unknown LTCCS Codebook Brakes Data Set • 12 Codebook - Brakes Data Set Format Type Length Variable Name OT4F Numeric 8 BRAPosition Definition: Identifies on which unit of the truck configuration a particular axle is located. N Prcnt Code Label 3,215 60.9 1 First Unit 1,623 30.7 2 Second Unit 120 2.3 3 Third Unit 325 6.2 9 Unknown Format Type Length Variable Name ML535F Numeric 8 ABSInstalled Definition: Indicates whether or not ABS is available at a particular axle. N Prcnt Code Label 2,537 48.0 0 No 1,588 30.1 1 Yes 1,158 21.9 99 Unknown Variable Name ABSFunctional Format ML536F Type Numeric Length 8 Definition: Indicates whether or not the ABS is functioning properly at a particular axle. N Prcnt Code Label 2,270 43.0 0 No 1,192 22.6 1 Yes 1,821 34.5 99 Unknown Variable Name Format Type Length ML537F Numeric 8 AdjustorType Definition: Indicates the type of brake adjustment system that is present at a particular axle. N Prcnt Code Label 1,616 30.6 1 Man 2,405 45.5 2 Auto 1,262 23.9 99 Unknown LTCCS Codebook Brakes Data Set • 13 Codebook - Brakes Data Set Format Type Length OT5F14.2 Numeric 8 ChamberSize Definition: Documents the size of the brake chamber for the braking system at a particular axle. N Prcnt Code Label 1 0.0 1.83 1.83 3 0.1 2.06 2.06 1 0.0 10.8 10.80 1 0.0 11.43 11.43 2 0.0 13.3 13.30 2 0.0 13.34 13.34 12 0.2 14.45 14.45 6 0.1 14.5 14.50 35 0.7 16.19 16.19 21 0.4 16.2 16.20 6 0.1 16.27 16.27 3 0.1 16.5 16.50 200 3.8 17.2 17.20 12 0.2 17.21 17.21 399 7.6 17.22 17.22 1 0.0 17.7 17.70 2 0.0 18 18.00 2 0.0 18.3 18.30 2 0.0 18.33 18.33 187 3.5 18.34 18.34 66 1.2 18.4 18.40 5 0.1 20 20.00 3 0.1 20.5 20.50 151 2.9 20.55 20.55 1,892 35.8 20.56 20.56 868 16.4 20.6 20.60 2 0.0 20.64 20.64 3 0.1 22.86 22.86 6 0.1 22.9 22.90 5 0.1 24 24.00 2 0.0 27.94 27.94 47 0.9 30 30.00 1 0.0 30.48 30.48 5 0.1 38.1 38.10 3 0.1 40.64 40.64 17 0.3 41.9 41.90 9 0.2 41.91 41.91 LTCCS Codebook Brakes Data Set • 14 Codebook - Brakes Data Set N Prcnt Code Label 10 0.2 45.7 45.70 3 0.1 45.72 45.72 2 0.0 50.8 50.80 4 0.1 60.96 60.96 18 0.3 76.2 76.20 263 5.0 8887 Not Applicable 515 9.7 9994 Not Examined 485 9.2 9999 Unknown Format Type Length Variable Name ML539F Numeric 8 ChamberType Definition: Documents the type of chamber for a braking system at a particular axle. N Prcnt Code Label 1 0.0 1 A 6-15/16 1-3/8 4 0.1 3 C 8-1/16 1-3/4 1 0.0 8 C-6 4-1/2 1-1/4 4 0.1 9 C-9 5-1/4 1-3/8 20 0.4 10 C-12 5-11/16 1-3/8 55 1.0 11 C-16 6-3/8 1-3/4 623 11.8 12 C-20 6-25/32 1-3/4 241 4.6 13 C-24 7-7/32 1-3/4 3,024 57.2 14 C-30 8-3/32 2 10 0.2 15 C-36 9 2-1/4 2 0.0 16 D-30 8-1/8 2-1/4 4 0.1 17 DISC NA 28 0.5 18 ELEC NA 156 3.0 19 HYDR NA 2 0.0 20 L-16 6-3/8 2.0 13 0.2 21 L-20 6-25/32 2.0 22 0.4 22 L-24 7-7/32 2.0 5 0.1 23 L-24* 7-7/32 2.5 68 1.3 24 L-30 8-3/32 2.5 1 0.0 25 MM 8-1/8 2-1/4 1 0.0 29 R-20 5-15/16 2 6 0.1 30 R-24 6-13/32 2 2 0.0 31 R-30 7-1/16 2-1/4 27 0.5 34 WEDG 5/16 5/16 43 0.8 88 Not Applicable 920 17.4 99 Unknown LTCCS Codebook Brakes Data Set • 15 Codebook - Brakes Data Set Format Type Length Variable Name ML531F Numeric 8 StrokeType Definition: Indicates whether a particular chamber type is categorized as long or short. N Prcnt Code Label 218 4.1 1 Long 3,738 70.8 2 Short 822 15.6 3 Not Examined 505 9.6 9 Unknown Format Type Length Variable Name OT6F14.2 Numeric 8 LeftLength Definition: Documents the length (in centimeters) of the left brake chamber at a particular axle. This value is measured and provided by the FMCSA Truck Inspector. N Prcnt Code Label 7 0.1 0 0.00 20 0.4 0.13 0.13 2 0.0 0.16 0.16 1 0.0 0.19 0.19 1 0.0 0.24 0.24 4 0.1 0.25 0.25 11 0.2 0.32 0.32 2 0.0 0.35 0.35 1 0.0 0.40 0.40 1 0.0 0.48 0.48 ------------------------------ 1 0.0 10.48 10.48 1 0.0 12.90 12.90 3 0.1 13.96 13.96 1 0.0 14.52 14.52 1 0.0 15.32 15.32 1 0.0 16.13 16.13 265 5.0 8887 Not Applicable 68 1.3 9992 Inoperable 965 18.3 9994 Not Examined 167 3.2 9999 Unknown LTCCS Codebook Brakes Data Set • 16 Codebook - Brakes Data Set Format Type Length Variable Name OT6F14.2 Numeric 8 RightLength Definition: Documents the length (in centimeters) of the right brake chamber at a particular axle. This value is measured and provided by the FMCSA Truck Inspector. N Prcnt Code Label 8 0.2 0 0.00 1 0.0 0.01 0.01 21 0.4 0.13 0.13 3 0.1 0.16 0.16 1 0.0 0.19 0.19 4 0.1 0.25 0.25 2 0.0 0.29 0.29 12 0.2 0.32 0.32 2 0.0 0.35 0.35 2 0.0 0.40 0.40 ------------------------------ 1 0.0 13.96 13.96 1 0.0 14.28 14.28 1 0.0 14.52 14.52 2 0.0 14.59 14.59 1 0.0 15.32 15.32 1 0.0 16.13 16.13 263 5.0 8887 Not Applicable 60 1.1 9992 Inoperable 963 18.2 9994 Not Examined 165 3.1 9999 Unknown LTCCS Codebook Brakes Data Set • 17 Codebook - CargoShiftAssessments Data Set CargoShiftAssessments Data Set 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 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: Format Type Length Variable Name ML1609F Numeric 8 ACSType Definition: 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. N Prcnt Code Label 909 39.8 0 No pre-crash cargo shift 5 0.2 2 Bulk freight (containerized) 10 0.4 3 Bulk freight (not containerized) 14 0.6 4 Large objects (solids) 10 0.4 6 Tank -liquids 1,300 56.9 77 Not applicable 4 0.2 88 Other (specify) 32 1.4 99 Unknown Format Type Length Variable Name ML1607F Numeric 8 ACSLocation Definition: Establishes the vehicle location at the start of the cargo shift sequence. N Prcnt Code Label 909 39.8 0 No pre-crash event 40 1.8 1 On roadway 2 0.1 2 On shoulder 1 0.0 3 On roadside 1,297 56.8 7 Not applicable 35 1.5 9 Unknown LTCCS Codebook CargoShiftAssessments Data Set • 18 Codebook - CargoShiftAssessments Data Set Variable Name Format Type Length MovementCount BEST8 Numeric 8 Definition: 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. N Prcnt Code Label 2,241 98.1 0 0 6 0.3 1 1 27 1.2 2 2 9 0.4 3 3 1 0.0 4 4 Variable Name Format Type Length AP2U Numeric 8 CauseCount Definition: Documents the number of circumstances associated with a cargo shift that were coded for this vehicle. Refers to the possible causes of the cargo shift. N Prcnt Code Label 2,241 98.1 0 0 31 1.4 1 1 8 0.4 2 2 2 0.1 3 3 2 0.1 99 99 Variable Name Format Type Length ML1608F Numeric 8 ACSSpillage Definition: Establishes the occurrence of cargo spillage during the precrash phase. N Prcnt Code Label 909 39.8 0 No pre-crash cargo shift 10 0.4 1 Yes (specify) 34 1.5 2 No 1,295 56.7 7 Not applicable 36 1.6 9 Unknown LTCCS Codebook CargoShiftAssessments Data Set • 19 Codebook - CargoShiftAssessments Data Set Variable Name Format Type Length ACSConstant AP1U Numeric 8 Definition: 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.”) N Prcnt Code Label 2,265 99.2 0 Absent 19 0.8 1 Present Variable Name Format Type Length AP1U Numeric 8 ACSCurve Definition: 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.”) N Prcnt Code Label 2,254 98.7 0 Absent 30 1.3 1 Present Format Type Length Variable Name AP1U Numeric 8 ACSTurn Definition: 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.”) N Prcnt Code Label 2,276 99.6 0 Absent 8 0.4 1 Present Variable Name Format Type Length AP1U Numeric 8 ACSLightBraking Definition: 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 with a normal traffic stop. (This variable was originally an attribute choice under the variable “Circumstances In Which Event Occurred.”) N Prcnt Code Label 2,282 99.9 0 Absent 2 0.1 1 Present LTCCS Codebook CargoShiftAssessments Data Set • 20 Codebook - CargoShiftAssessments Data Set Variable Name Format Type Length AP1U Numeric 8 Definition: 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 ACSAccelerating Event Occurred.”) N Prcnt Code Label 2,280 99.8 0 Absent 4 0.2 1 Present Variable Name Format Type Length AP1U Numeric 8 ACSAvoidance Definition: 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.”) N Prcnt Code Label 2,277 99.7 0 Absent 7 0.3 1 Present Format Type Length Variable Name AP1U Numeric 8 OtherMovement Definition: 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.) N Prcnt Code Label 2,279 99.8 0 Absent 5 0.2 1 Present Variable Name Format Type Length AP1U Numeric 8 ACSDecelerating Definition: 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.”) N Prcnt Code Label 2,284 100.0 0 Absent LTCCS Codebook CargoShiftAssessments Data Set • 21 Codebook - CargoShiftAssessments Data Set Format Type LengthVariable Name AP1U Numeric 8 ACSModerateBraking Definition: 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.”) N Prcnt Code Label 2,281 99.9 0 Absent 3 0.1 1 Present Format Type LengthVariable Name AP1U Numeric 8 ACSHeavyBraking Definition: 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.”) N Prcnt Code Label 2,277 99.7 0 Absent 7 0.3 1 Present Format Type LengthVariable Name AP1U Numeric 8 ACSStraight Definition: 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.”) N Prcnt Code Label 2,278 99.7 0 Absent 6 0.3 1 Present LTCCS Codebook CargoShiftAssessments Data Set • 22 Codebook - CargoShiftAssessments Data Set Format Type LengthVariable Name AP1U Numeric 8 ImproperGeneralLoading Definition: 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.”) N Prcnt Code Label 2,282 99.9 0 Absent 2 0.1 1 Present Format Type LengthVariable Name AP1U Numeric 8 ImproperBulkLoading Definition: 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.”) N Prcnt Code Label 2,281 99.9 0 Absent 3 0.1 1 Present Variable Name Format Type Length AP1U Numeric 8 SparseTieDowns Definition: 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.”) N Prcnt Code Label 2,268 99.3 0 Absent 16 0.7 1 Present Format Type Length Variable Name AP1U Numeric 8 WeakTieDowns Definition: 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.”) N Prcnt Code Label 2,275 99.6 0 Absent 9 0.4 1 Present LTCCS Codebook CargoShiftAssessments Data Set • 23 Codebook - CargoShiftAssessments Data Set Variable Name Format Type Length OtherSolids AP1U Numeric 8 Definition: 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.”) N Prcnt Code Label 2,273 99.5 0 Absent 11 0.5 1 Present Variable Name Format Type Length AP1U Numeric 8 Sloshing Definition: 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.”) N Prcnt Code Label 2,274 99.6 0 Absent 10 0.4 1 Present Format Type Length Variable Name AP1U Numeric 8 BaffleFailure Definition: 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.”) N Prcnt Code Label 2,284 100.0 0 Absent Format Type Length Variable Name AP1U Numeric 8 CompartmentFailure Definition: 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.”) N Prcnt Code Label 2,284 100.0 0 Absent LTCCS Codebook CargoShiftAssessments Data Set • 24 Codebook - CargoShiftAssessments Data Set Variable Name Format Type Length TankFailure AP1U Numeric 8 Definition: 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.”) N Prcnt Code Label 2,284 100.0 0 Absent Format Type Length Variable Name AP1U Numeric 8 OtherLiquids Definition: 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.”) N Prcnt Code Label 2,284 100.0 0 Absent Variable Name Format Type Length AP1U Numeric 8 OtherCargos Definition: 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.”) N Prcnt Code Label 2,282 99.9 0 Absent 2 0.1 1 Present Format Type Length Variable Name AP1U Numeric 8 UnknownCause Definition: 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.”) N Prcnt Code Label 2,282 99.9 0 Absent 2 0.1 1 Present LTCCS Codebook CargoShiftAssessments Data Set • 25 Codebook - CDCCrush Data Set CDCCrush Data Set 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 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. Format Type Length Variable Name BEST8 Numeric 8 EventNumber Definition: Identifies a particular event in a sequence in the accident. N Prcnt Code Label 1,742 43.8 1 1 986 24.8 2 2 530 13.3 3 3 295 7.4 4 4 163 4.1 5 5 103 2.6 6 6 55 1.4 7 7 29 0.7 8 8 17 0.4 9 9 11 0.3 10 10 5 0.1 11 11 7 0.2 12 12 5 0.1 13 13 5 0.1 14 14 1 0.0 15 15 1 0.0 16 16 1 0.0 19 19 1 0.0 20 20 2 0.1 21 21 2 0.1 22 22 1 0.0 23 23 2 0.1 24 24 2 0.1 25 25 1 0.0 26 26 1 0.0 27 27 1 0.0 32 32 LTCCS Codebook CDCCrush Data Set • 26 Codebook - CDCCrush Data Set N Prcnt Code Label 1 0.0 33 33 1 0.0 34 34 1 0.0 39 39 1 0.0 41 41 Variable Name Format Type Length BEST8 Numeric 8 PositionNumber Definition: 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. N Prcnt Code Label 3,433 86.4 1 1 514 12.9 2 2 26 0.7 3 3 Variable Name Format Type Length $1 Char 1 DCType Definition: Indicates whether the deformation classification is related to a car or a truck. N Prcnt Code Label 3,973 100.0 T T Format Type Length Variable Name ML33F Numeric 8 ObjectContactClass Definition: Describes the category of object involved in a particular impact to a vehicle. N Prcnt Code Label 2,617 65.9 1 Vehicle 480 12.1 2 Noncollision 726 18.3 3 Collision with Fixed Object 141 3.5 5 Collision with Nonfixed Object 3 0.1 6 Unknown event or object 6 0.2 7 Other event (specify) LTCCS Codebook CDCCrush Data Set • 27 Codebook - CDCCrush Data Set Format Type Length Variable Name ML34F Numeric 8 CDCObjectContact Definition: Identifies the object that was contacted for this event/impact. N Prcnt Code Label 1,791 45.1 1 Vehicle#1 406 10.2 2 Vehicle#2 206 5.2 3 Vehicle#3 121 3.0 4 Vehicle#4 41 1.0 5 Vehicle#5 29 0.7 6 Vehicle#6 6 0.2 7 Vehicle#7 1 0.0 18 Vehicle#18 2 0.1 19 Vehicle#19 5 0.1 21 Vehicle#21 2 0.1 22 Vehicle#22 3 0.1 24 Vehicle#24 1 0.0 27 Vehicle#27 2 0.1 28 Vehicle#28 1 0.0 30 Vehicle#30 312 7.9 31 Overturn->rollover(excludes end-over-end) 126 3.2 34 Jackknife 29 0.7 35 Other intraunit damage (specify) 13 0.3 38 Other noncollision (specify) 13 0.3 41 Tree(<= 10 cm in diameter) 43 1.1 42 Tree(> 10 cm in diameter) 9 0.2 43 Shrubbery or bush 23 0.6 44 Embankment 24 0.6 45 Breakaway pole or post (any diameter) 34 0.9 50 Nonbreakaway pole or post (<=10cm in diameter) 38 1.0 51 Nonbreakaway pole or post(>10 cm but <= 30 cm in diameter) 13 0.3 52 Nonbreakaway pole or post(>30 cm in diameter) 6 0.2 53 Nonbreakaway pole or post(diameter unknown) 189 4.8 54 Concrete traffic barrier 6 0.2 55 Impact attenuator 157 4.0 56 Other traffic barrier(includes guardrail) (specify) 32 0.8 57 Fence 18 0.5 58 Wall 4 0.1 59 Building 14 0.4 60 Ditch or culvert 19 0.5 61 Ground 2 0.1 62 Fire hydrant LTCCS Codebook CDCCrush Data Set • 28 Codebook - CDCCrush Data Set N Prcnt Code Label 27 0.7 63 Curb 30 0.8 64 Bridge 24 0.6 68 Other fixed object (specify) 1 0.0 69 Unknown fixed object 23 0.6 70 Pass. car,light truck,van,or other vehicle not in-transport 1 0.0 71 Medium/heavy truck or bus not in-transport 38 1.0 72 Pedestrian 8 0.2 73 Cyclist or cycle 1 0.0 75 Vehicle occupant 1 0.0 76 Animal 8 0.2 77 Train 4 0.1 78 Trailer, disconnected in transport 36 0.9 79 Object fell from vehicle in-transport 21 0.5 88 Other nonfixed object (specify) 6 0.2 98 Other event (specify) 3 0.1 99 Unknown event or object Variable Name Format Type Length BEST8 Numeric 8 ForceDirection Definition: Indicates the direction of force exerted upon the vehicle by an object. If the force is applied directly upon the center of the front bumper, the force of direction is said to be “0.” The direction of force rotates to the right around the vehicle in increments of 10 degrees, circling around the vehicle until it returns to the front (360 degrees). This value is used to create the variable “Clock Force. N Prcnt Code Label 658 16.6 0 0 220 5.5 10 10 110 2.8 20 20 104 2.6 30 30 27 0.7 40 40 31 0.8 50 50 21 0.5 60 60 39 1.0 70 70 54 1.4 80 80 118 3.0 90 90 33 0.8 100 100 21 0.5 110 110 18 0.5 120 120 5 0.1 130 130 13 0.3 140 140 27 0.7 150 150 LTCCS Codebook CDCCrush Data Set • 29 Codebook - CDCCrush Data Set N Prcnt Code Label 56 1.4 160 160 99 2.5 170 170 305 7.7 180 180 85 2.1 190 190 57 1.4 200 200 20 0.5 210 210 24 0.6 220 220 11 0.3 230 230 13 0.3 240 240 15 0.4 250 250 27 0.7 260 260 129 3.2 270 270 60 1.5 280 280 31 0.8 290 290 40 1.0 300 300 20 0.5 310 310 34 0.9 320 320 76 1.9 330 330 120 3.0 340 340 306 7.7 350 350 575 14.5 888 888 371 9.3 999 999 Format Type Length Variable Name BEST8 Numeric 8 ClockForce Definition: Identifies the direction from which the principal force is applied for a particular impact. The direction of force is based on the face of a clock (e.g. an impact to the front bumper is classified as “12”) and is the first two columns of each impact’s CDC/TDC. N Prcnt Code Label 575 14.5 0 0 233 5.9 1 1 86 2.2 2 2 200 5.0 3 3 43 1.1 4 4 96 2.4 5 5 483 12.2 6 6 101 2.5 7 7 37 0.9 8 8 213 5.4 9 9 88 2.2 10 10 223 5.6 11 11 LTCCS Codebook CDCCrush Data Set • 30 Codebook - CDCCrush Data Set N Prcnt Code Label 1,166 29.3 12 12 149 3.8 13 13 3 0.1 26 26 4 0.1 32 32 1 0.0 46 46 3 0.1 52 52 3 0.1 61 61 2 0.1 63 63 1 0.0 64 64 1 0.0 66 66 1 0.0 68 68 2 0.1 69 69 2 0.1 70 70 7 0.2 71 71 5 0.1 81 81 5 0.1 82 82 3 0.1 83 83 1 0.0 86 86 1 0.0 88 88 1 0.0 89 89 1 0.0 90 90 10 0.3 92 92 223 5.6 99 99 Variable Name Format Type Length ML82F Numeric 8 OverrideDesc Definition: Indicates that this vehicle overrode or underrode another vehicle. “Override” is coded when this vehicle overrides (i.e. goes on top of) the bumper of another vehicle, and “underride” is coded when this vehicle underrides (i.e. goes below) the bumper of another vehicle. For override/underride in combination cases (CDS/Truck cases), the attribute “Medium/heavy truck or bus override” is used. N Prcnt Code Label 3,374 84.9 1 None 3 0.1 2 Override 4 0.1 3 Underride 88 2.2 4 Medium/heavy truck or bus over 130 3.3 11 Underride, compartment intrusion 77 1.9 12 Underride, no compartment intrusion 6 0.2 13 Underride, compartment intrusion unknown 229 5.8 14 Override, motor vehicle in transport LTCCS Codebook CDCCrush Data Set • 31 Codebook - CDCCrush Data Set N Prcnt Code Label 7 0.2 15 Override, motor vehicle not in transport 55 1.4 16 Unknown Variable Name Format Type Length $OT8F Char 1 DeformLocation Definition: Documents the initial plane of contact to the vehicle and represents the general area of the vehicle. This is the third column in a coded CDC/TDC. N Prcnt Code Label 43 1.1 9 Unknown 528 13.3 B Back of unit w/ cargo area 42 1.1 C Rear of cab 21 0.5 D Back -rear of tractor 1,538 38.7 F Front 838 21.1 L Left Side 712 17.9 R Right Side 157 4.0 T Top 48 1.2 U Undercarriage 46 1.2 V Front of cargo area Format Type Length Variable Name $50 Char 50 DeformLong Definition: Documents the lateral or longitudinal area of the vehicle that contains the contact deformation. This is the fourth column in a coded CDC/TDC. N Prcnt Code Label 370 9.3 * 9 Unknown 13 0.3 * B Rear Section 102 2.6 * B Side Rear -left or right 69 1.7 * B Side rear of cab to rear of trailer/cargo area 24 0.6 * C Center -front or rear 76 1.9 * D Distributed -(F+P+B) 1,250 31.5 * D Distributed -side or end 6 0.2 * F Front Section 61 1.5 * F Side Front -frontof windshield 81 2.0 * F Side Front -left or right 20 0.5 * K Side(P + W) 373 9.4 * L Left -front or rear 12 0.3 * P Center Section 63 1.6 * P Side cab 53 1.3 * P Side center section L or R LTCCS Codebook CDCCrush Data Set • 32 Codebook - CDCCrush Data Set N Prcnt Code Label 310 7.8 * R Right -front or rear 14 0.4 * S Side(F + P + W) 299 7.5 * T Trailer 37 0.9 * W Side rear of cab to rear of tractor 397 10.0 * Y Side (F + P) OR End (L + C) 18 0.5 * Y Side Front/Center Section (F+P) 315 7.9 * Z Side (P + B) OR End (C + R) 10 0.3 * Z Side Center/Rear Section(P+B) Note: Asterisk in code column indicates that the stored value is the same as the value in the label column. Format Type Length Variable Name $50 Char 50 DeformVertical Definition: Documents either the vertical or lateral area of the vehicle that contains the contact deformation. The vertical location is used for vertical planes (F, B, L, R) and the lateral location is used for horizontal planes (T, U). This is the fifth column in a coded CDC/TDC. N Prcnt Code Label 388 9.8 * 9 Unknown 450 11.3 * A All 453 11.4 * A Top to Bottom of vehicle / no wheels 20 0.5 * B Belt Line and above 5 0.1 * C Center 108 2.7 * D Distributed 958 24.1 * E Everything below belt line 846 21.3 * E belt line and below 133 3.3 * F Belt line/below on trailer 42 1.1 * G Belt line and above 30 0.8 * H Top of frame to top 49 1.2 * H Top of frame to top of vehicle 40 1.0 * L Frame --top of frame,frame, bottom of frame 13 0.3 * L Left 202 5.1 * L Low -top of frame, frame, and bottom of frame 60 1.5 * M Middle --top of frame to belt line or hood 10 0.3 * R Right 5 0.1 * T Everything above cab 16 0.4 * T Trailer 122 3.1 * W Below undercarriage level ( wheels and tires only) 16 0.4 * Y Left and Center (L+C) 7 0.2 * Z Right and Center(R+C) Note: Asterisk in code column indicates that the stored value is the same as the value in the label column. LTCCS Codebook CDCCrush Data Set • 33 Codebook - CDCCrush Data Set Format Type Length Variable Name $OT7F Char 1 DeformDistribution Definition: Documents the general type of damage distribution for the impact. This classification provides a qualitative description of the type of damage sustained by the vehicle. This is the sixth column of a coded CDC/TDC. N Prcnt Code Label 461 11.6 9 Unknown 34 0.9 A Overhanging Structure 230 5.8 E Corner 4 0.1 K Conversion in Impact Type 190 4.8 N Narrow Impact Area 314 7.9 O Rollover (include side) 11 0.3 R Override 196 4.9 S Sideswipe 22 0.6 U No residual deformation 2,511 63.2 W Wide Impact Area Format Type Length Variable Name $OT9F Char 10 DeformExtent Definition: Documents the extent of damage for the impact. The extent of residual deformation is classified using a nine-zone extent system. Extent is a mathematical determination of which zone the crush extends into, beginning with Zone “1.” This is the seventh column of a coded CDC/TDC. N Prcnt Code Label 457 11.5 0A 0A 67 1.7 0B 0B 17 0.4 0C 0C 13 0.3 0D 0D 10 0.3 0X 0X 47 1.2 Eight Eight 94 2.4 Five Five 158 4.0 Four Four 118 3.0 Nine Nine 1,069 26.9 One One 98 2.5 Seven Seven 127 3.2 Six Six 413 10.4 Three Three 623 15.7 Two Two 662 16.7 Unknown Unknown LTCCS Codebook CDCCrush Data Set • 34 Codebook - CDCCrush Data Set Format Type Length Variable Name $15 Char 15 DeformCode Definition: Identifies the direction from which the principal force is applied for a particular impact. The direction of force is based on the face of a clock (e.g. an impact to the front bumper is classified as “12”) and is the first two columns of each impact’s CDC/TDC. N Prcnt Code Label 4 0.1 * 00999999 1 0.0 * 00999O03 1 0.0 * 00999O99 2 0.1 * 009T9999 1 0.0 * 00B9990A 3 0.1 * 00B99999 1 0.0 * 00BDAW03 1 0.0 * 00BDAW99 1 0.0 * 00BDEW99 1 0.0 * 00BDFW0A ------------------------------ 1 0.0 * 99RW9999 1 0.0 * 99RYAN01 1 0.0 * 99RZEW09 1 0.0 * 99RZEW99 1 0.0 * 99TDDW08 1 0.0 * 99U99901 1 0.0 * 99U99999 1 0.0 * 99UT9W99 1 0.0 * 99V99999 1 0.0 * 99VT990X Note: Asterisk in code column indicates that stored value is the same as the value in the label column. Format Type Length Variable Name BEST8 Numeric 8 ImpactNumber Definition: Identifies each particular impact in the crush profile for a vehicle. N Prcnt Code Label 1,799 45.3 1 1 831 20.9 2 2 374 9.4 3 3 153 3.9 4 4 50 1.3 5 5 23 0.6 6 6 12 0.3 7 7 5 0.1 8 8 726 18.3 9 9 LTCCS Codebook CDCCrush Data Set • 35 Codebook - CDCCrush Data Set Variable Name Format Type Length $50 Char 50 DamageLocation Definition: Describes the location of the direct damage on the vehicle for each impact. This information is used to determine the CDC/TDC for the impact. N Prcnt Code Label 1 0.0 * #3 axle left wheel 1 0.0 * #4 and #5 left side wheels 1 0.0 * #4 inside wheel right 1 0.0 * #4 outside wheel right 1 0.0 * -begins LF corner inward 1 0.0 * 0 TO 120 CM FROM RIGHT REAR BC 1 0.0 * 0 TO 140 CM FROM RIGHT REAR BC 1 0.0 * 0 TO 170 FROM FRT LEFT BC 1 0.0 * 0 TO 70 CM FROM FRONT RIGHT BC 1 0.0 * 0-110 CM FORWARD FRT AXLE ------------------------------ 1 0.0 * wheel/axle damage 4 0.1 * whole front 2 0.1 * whole front bumper 1 0.0 * whole front end 1 0.0 * whole left side and roof 1 0.0 * whole left side of vehicle 1 0.0 * whole rear bumper guard 1 0.0 * whole right side 1 0.0 * whole underguard 1 0.0 * windshield Note: Asterisk in code column indicates that the stored value is the same as the value in the label column. Format Type Length Variable Name $50 Char 50 FieldLocation Definition: Describes the location of the Field L on the vehicle. Field L represents direct and induced deformation. This information is used to determine the CDC/TDC for the impact. N Prcnt Code Label 1 0.0 * #3 axle left wheel 1 0.0 * #4 & #5 left side wheels 1 0.0 * #4 inside wheel right 1 0.0 * #4 outside wheel right 1 0.0 * #7 right tire 1 0.0 * ---- LTCCS Codebook CDCCrush Data Set • 36 Codebook - CDCCrush Data Set N Prcnt Code Label 1 0.0 * 0-110 CM FORWARD FRT AXLE 1 0.0 * 0-110 CM FWD FRT AXLE 1 0.0 * 0-290 CM BEHIND FRT AXLE 1 0.0 * 0-60CM FROM RT RR CORNER OF TRAILER ------------------------------ 2 0.1 * whole front 11 0.3 * whole front bumper 2 0.1 * whole front end 1 0.0 * whole left side and roof 1 0.0 * whole left side of vehicle 1 0.0 * whole rear 2 0.1 * whole rear bumper 1 0.0 * whole rear bumper guard 1 0.0 * whole right side 1 0.0 * whole underguard Note: Asterisk in code column indicates that the stored value is the same as the value in the label column. Variable Name Format Type Length $50 Char 50 MaxCrushLocation Definition: Describes the location in the crush profile of the maximum crush of this impact to the vehicle. This information is used to determine the CDC/TDC for the impact. N Prcnt Code Label 1 0.0 * # 1 0.0 * #3 axle left wheel 1 0.0 * #4 left outside wheel 1 0.0 * #5 axle 1 0.0 - 10 0.3 * -- 11 0.3 * -- 4 0.1 * --- 1 0.0 * ---- 1 0.0 * ----- ------------------------------ 1 0.0 * whole front bumper 1 0.0 * windshield header 90cm left of rt A pillar 1 0.0 * xxx 5 0.1 * zone 8 0.2 * zone 8 0.2 * zone 3 0.1 * zone 1 0.0 * zone LTCCS Codebook CDCCrush Data Set • 37 Codebook - CDCCrush Data Set N Prcnt Code Label 2 0.1 * zone 6 1 0.0 * zone 9 Note: Asterisk in code column indicates that the stored value is the same as the value in the label column. Variable Name Format Type Length ML119F Numeric 8 CDCCategory Definition: Describes the information provided by columns 3-7 in a coded CDC/TDC. N Prcnt Code Label 1,194 30.1 1 Side 1,832 46.1 2 End 133 3.3 3 Top (specify) 44 1.1 4 Under (specify) 724 18.2 97 Not Applicable 46 1.2 99 Unknown Variable Name Format Type Length BEST8 Numeric 8 CDCWidth Definition: Indicates the direct damage width in centimeters. This is a measured value on the vehicle that is used in determining the CDC/TDC for this impact/event. N Prcnt Code Label 2 0.1 0 0 2 0.1 1 1 2 0.1 3 3 1 0.0 4 4 5 0.1 5 5 3 0.1 6 6 7 0.2 7 7 3 0.1 8 8 2 0.1 9 9 17 0.4 10 10 ------------------------------ 1 0.0 2200 2200 1 0.0 2225 2225 1 0.0 2249 2249 1 0.0 2250 2250 1 0.0 2260 2260 1 0.0 2280 2280 2 0.1 2300 2300 1 0.0 2615 2615 LTCCS Codebook CDCCrush Data Set • 38 Codebook - CDCCrush Data Set N Prcnt Code Label 728 18.3 9997 9997 1,253 31.5 9999 9999 LTCCS Codebook CDCCrush Data Set • 39 Codebook - Crash Data Set Crash Data Set 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 Crash data set contains the variables CaseID, PSU, PSUStrat and RATWeight. CaseID uniquely identifies each record in this data set and should be used to merge the Crash data set with other data sets. Format Type Length Variable Name $10 Char 10 CrashDate Definition: Identifies the date of the crash. N Prcnt Code Label 25 2.3 * 2001-01-01 19 1.8 * 2001-02-01 31 2.9 * 2001-03-01 29 2.7 * 2001-04-01 30 2.8 * 2001-05-01 38 3.6 * 2001-06-01 25 2.3 * 2001-07-01 31 2.9 * 2001-08-01 25 2.3 * 2001-09-01 42 3.9 * 2001-10-01 ------------------------------ 38 3.6 * 2003-03-01 33 3.1 * 2003-04-01 31 2.9 * 2003-05-01 31 2.9 * 2003-06-01 31 2.9 * 2003-07-01 22 2.1 * 2003-08-01 19 1.8 * 2003-09-01 30 2.8 * 2003-10-01 21 2.0 * 2003-11-01 26 2.4 * 2003-12-01 Note: Asterisk in code column indicates that the stored value is the same as the value in the label column. LTCCS Codebook Crash Data Set • 40 Codebook - Crash Data Set Format Type Length Variable Name $6 Char 6 CrashTime Definition: Identifies the time of day of the crash. N Prcnt Code Label 1 0.1 * 00:03 1 0.1 * 00:08 1 0.1 * 00:10 1 0.1 * 00:15 2 0.2 * 00:20 2 0.2 * 00:25 1 0.1 * 00:29 1 0.1 * 00:30 1 0.1 * 00:31 1 0.1 * 00:35 ------------------------------ 1 0.1 * 22:45 3 0.3 * 22:52 2 0.2 * 22:55 1 0.1 * 23:00 1 0.1 * 23:11 1 0.1 * 23:25 3 0.3 * 23:30 1 0.1 * 23:55 1 0.1 * 23:57 1 0.1 * 23:58 Note: Asterisk in code column indicates that the stored value is the same as the value in the label column. Format Type Length Variable Name BEST8 Numeric 8 VehicleCount Definition: Documents the total number of vehicles that were involved in the crash. This includes all CDS, non-CDS, in-transport, and not in-transport vehicles. N Prcnt Code Label 273 25.5 1 1 545 50.9 2 2 164 15.3 3 3 53 5.0 4 4 21 2.0 5 5 10 0.9 6 6 2 0.2 7 7 1 0.1 8 8 1 0.1 30 30 LTCCS Codebook Crash Data Set • 41 Codebook - Crash Data Set Variable Name Format Type Length BEST8 Numeric 8 TruckCount Definition: Represents the total number of heavy trucks involved in the crash. N Prcnt Code Label 937 87.6 1 1 109 10.2 2 2 14 1.3 3 3 6 0.6 4 4 4 0.4 5 5 Variable Name Format Type Length BEST8 Numeric 8 CarCount Definition: Represents the total number of passenger vehicles involved in the crash. N Prcnt Code Label 343 32.1 0 0 543 50.7 1 1 127 11.9 2 2 40 3.7 3 3 8 0.7 4 4 6 0.6 5 5 1 0.1 6 6 1 0.1 7 7 1 0.1 28 28 Format Type Length Variable Name BEST8 Numeric 8 NonMotoristCount Definition: Identifies the number of nonmotorists involved in the crash. N Prcnt Code Label 1,025 95.8 0 0 42 3.9 1 1 2 0.2 2 2 1 0.1 7 7 LTCCS Codebook Crash Data Set • 42 Codebook - Crash Data Set Format Type Length Variable Name $50 Char 50 CrashType Definition: This variable is a combination of two variables separated by “-+-”. The first is a description of the overall crash scenario. The second is a general description of the crash configuration. N Prcnt Code Label 1 0.1 * -+ 1 0.1 * Angle -+-Vehicle to vehicle 1 0.1 * Bus / Tractor Trailer -+-Rear End 1 0.1 * CAR VS. TRUCK -+-SIDE IMPACT 1 0.1 * CAR / CAR / TRUCK -+-MULTIPLE IMPACTS 1 0.1 * CAR / TRUCK -+-HEAD-ON 1 0.1 * CAR VS DUMP TRUCK -+-TURN INTO PATH 1 0.1 * CAR VS Tractor trailer -+-sideswipe same direction 1 0.1 * CAR, PICK UP, TRACTOR TRAILER -+-MUTIPLE IMPACTS 1 0.1 * CAR/ STRAIGHT TRUCK TRAILER -+-REAREND ------------------------------ 1 0.1 * vehicle to vechile -+-angle/sideswipe 4 0.4 * vehicle to vehicle -+-angle 1 0.1 * vehicle to vehicle -+-angle / sideswipe 1 0.1 * vehicle to vehicle -+-angle/ sideswipe 2 0.2 * vehicle to vehicle -+-angle/sideswipe 1 0.1 * vehicle to vehicle -+-noncollision 3 0.3 * vehicle to vehicle -+-rear end 1 0.1 * vehicle to vehicle -+-rear-end 1 0.1 * vehicle to vehicle -+-rollover 1 0.1 * vehicleto object -+- Angle/sideswipe Note: Asterisk in code column indicates that the stored value is the same as the value in the label column. Format Type Length Variable Name OT10F Numeric 8 CrashPARSevCode Definition: Represents the highest injury severity rating in the case, as determined by police on the Police Accident Report (PAR). N Prcnt Code Label 18 1.7 0 O -No injury 128 12.0 1 C -Possible injury 339 31.7 2 B -Non-incapacitating injury 336 31.4 3 A -Incapacitating injury 238 22.2 4 K -Killed 7 0.7 5 U -Injury, severity unknown LTCCS Codebook Crash Data Set • 43 Codebook - Crash Data Set N Prcnt Code Label 3 0.3 6 Died prior to crash 1 0.1 9 Unknown Variable Name Format Type Length CrashRESSevCode OT10F Numeric 8 Definition: Represents the highest injury severity rating in the case, as determined by injury coding and case narratives. This code is based on occupant medical records and/or case narratives and may differ from the police-reported injury severity code. N Prcnt Code Label 15 1.4 0 O -No injury 6 0.6 1 C -Possible injury 499 46.6 2 B -Non-incapacitating injury 303 28.3 3 A -Incapacitating injury 242 22.6 4 K -Killed 1 0.1 5 U -Injury, severity unknown 4 0.4 6 Died prior to crash Variable Name Format Type Length $15000 Char 15000 Summary Definition: The researcher’s description of the crash events/sequence. N Prcnt Code Label 1 0.1 * A 1999 Mack CL713 straight dump truck was traveling east in 1 0.1 * A 2001 Mitsubishi Eclipse, vehicle one, was traveling south on a 1 0.1 * A 3-vehicle collision occurred in mid June at approximately 1700 1 0.1 * A 6.8 Richter scale level earthquake had struck the surrounding 1 0.1 * A collision involving a car and a truck occurred on an urban 1 0.1 * A collision involving five vehicles occurred during a weekend 1 0.1 * A collision involving four vehicles occurred at 1040 hours on an 1 0.1 * A collision involving four vehicles occurred at 1220 hours on a 1 0.1 * A collision involving four vehicles occurred in the northbound 1 0.1 * A collision involving four vehicles occurred on a divided six-lane ------------------------------ 1 0.1 * Vehicle two, a 2000 Freightliner, was traveling west in lane three 1 0.1 * Vehicles 1 and 3 were traveling north in lane one on a dry, 1 0.1 * Vehicles 1, 2 & 3 were traveling south on a 3 lane, 1 way divided 1 0.1 * Vehicles 1, 2 and 3 were all traveling west in lane 3 of a 3-lane 1 0.1 * Vehicles 1, 2, and 3 were stopped facing southbound in lane 3 of 1 0.1 * Vehicles one and two were traveling southbound on a 55mph, 1 0.1 * Vehicles one and two were traveling southbound on a wet and LTCCS Codebook Crash Data Set • 44 Codebook - Crash Data Set N Prcnt Code Label 1 0.1 * Vehicles one, two, and three were southbound in lane 3 of a 1 0.1 * Vehicles' one, two and three were all traveling east on a three 1 0.1 * Vehicles' one, two and three were all traveling west on a 4-lane Note: Asterisk in code column indicates that the stored value is the same as the value in the label column. Variable Name Format Type Length OT11F Numeric 8 Day Definition: Identifies the day of the week that the crash occurred. N Prcnt Code Label 40 3.7 1 Sunday 182 17.0 2 Monday 205 19.2 3 Tuesday 203 19.0 4 Wednesday 190 17.8 5 Thursday 183 17.1 6 Friday 67 6.3 7 Saturday Format Type Length Variable Name OT70F Numeric 8 CollisionType Definition: Describes the type of vehicles involved in the crash using the following vehicle classifications. These classifications are “strung together” to indicate the number and type of each vehicle involved in the crash. N Prcnt Code Label 5 0.5 BUS-TRUCK 1 0.1 CAR-BUS-TRUCK 1 0.1 CAR-CAR-CAR-CAR-TRUCK 2 0.2 CAR-CAR-CAR-OLV-TRUCK 2 0.2 CAR-CAR-CAR-PICKUP-TRUCK 6 0.6 CAR-CAR-CAR-TRUCK 1 0.1 CAR-CAR-CAR-TRUCK-TRUCK 1 0.1 CAR-CAR-LIGHT TRUCK-TRUCK 1 0.1 CAR-CAR-LIGHT TRUCK-TRUCK-TRUCK 2 0.2 CAR-CAR-OLV-TRUCK 2 0.2 CAR-CAR-PICKUP-TRUCK 37 3.5 CAR-CAR-TRUCK 3 0.3 CAR-CAR-TRUCK-TRUCK 2 0.2 CAR-CAR-TRUCK-TRUCK-TRUCK 1 0.1 CAR-CAR-VAN-PICKUP-TRUCK 4 0.4 CAR-CAR-VAN-TRUCK 1 0.1 CAR-CAR-VAN-TRUCK-TRUCK LTCCS Codebook Crash Data Set • 45 Codebook - Crash Data Set N Prcnt Code Label 4 0.4 18 CAR-LIGHT TRUCK-TRUCK 5 0.5 19 CAR-OLV-OLV-TRUCK 2 0.2 20 CAR-OLV-PICKUP-TRUCK 1 0.1 21 CAR-OLV-PICKUP-TRUCK-TRUCK 17 1.6 22 CAR-OLV-TRUCK 1 0.1 23 CAR-OLV-TRUCK-MCYCLE 3 0.3 24 CAR-OLV-TRUCK-TRUCK 3 0.3 25 CAR-OLV-VAN-TRUCK 1 0.1 26 CAR-OLV-VAN-TRUCK-TRUCK 1 0.1 27 CAR-PICKUP-PICKUP-TRUCK 23 2.1 28 CAR-PICKUP-TRUCK 1 0.1 29 CAR-PICKUP-TRUCK-TRUCK 303 28.3 30 CAR-TRUCK 2 0.2 31 CAR-TRUCK-MCYCLE 26 2.4 32 CAR-TRUCK-TRUCK 1 0.1 33 CAR-TRUCK-TRUCK-MCYCLE 4 0.4 34 CAR-TRUCK-TRUCK-TRUCK 1 0.1 35 CAR-TRUCK-TRUCK-TRUCK-TRUCK 3 0.3 36 CAR-VAN-PICKUP-TRUCK 1 0.1 37 CAR-VAN-PICKUP-TRUCK-TRUCK 10 0.9 38 CAR-VAN-TRUCK 2 0.2 39 CAR-VAN-TRUCK-TRUCK 1 0.1 40 CAR-VAN-VAN-VAN-TRUCK 1 0.1 41 LIGHT TRUCK-TRUCK 1 0.1 42 LIGHT TRUCK-TRUCK-TRUCK 14 1.3 43 MULTI VEHICLE 2 0.2 44 OLV-OLV-TRUCK 1 0.1 45 OLV-PICKUP-PICKUP-TRUCK-TRUCK 4 0.4 46 OLV-PICKUP-TRUCK 55 5.1 47 OLV-TRUCK 5 0.5 48 LV-TRUCK-TRUCK 2 0.2 49 OLV-TRUCK-TRUCK-TRUCK 1 0.1 50 OLV-VAN-PICKUP-TRUCK 5 0.5 51 OLV-VAN-TRUCK 1 0.1 52 PICKUP-PICKUP-PICKUP-TRUCK 4 0.4 53 PICKUP-PICKUP-TRUCK 79 7.4 54 PICKUP-TRUCK 10 0.9 55 PICKUP-TRUCK-TRUCK 1 0.1 56 PICKUP-TRUCK-TRUCK-TRUCK-TRUCK 273 25.5 57 TRUCK 7 0.7 58 TRUCK-MCYCLE 2 0.2 59 TRUCK-OTHER 44 4.1 60 TRUCK-TRUCK LTCCS Codebook Crash Data Set • 46 Codebook - Crash Data Set N Prcnt Code Label 1 0.1 61 TRUCK-TRUCK-MHOME 5 0.5 62 TRUCK-TRUCK-TRUCK 3 0.3 63 TRUCK-TRUCK-TRUCK-TRUCK 3 0.3 64 TRUCK-TRUCK-TRUCK-TRUCK-TRUCK 2 0.2 65 VAN-PICKUP-TRUCK 50 4.7 66 VAN-TRUCK 1 0.1 67 VAN-TRUCK-MCYCLE 1 0.1 68 VAN-TRUCK-TRUCK 2 0.2 69 VAN-VAN-TRUCK 2 0.2 70 VAN-VAN-TRUCK-TRUCK Format Type Length Variable Name ML2065F Numeric 8 Treatment Definition: Represents the highest level of treatment of any occupant in the case. N Prcnt Code Label 122 11.4 0 No treatment 20 1.9 1 Dead on Arrival (DOA) at hospital 30 2.8 2 Dead prior to Admission 379 35.4 3 Hospitalization 457 42.7 4 Transported and released 13 1.2 5 Treatment at scene -non-transported 15 1.4 6 Treatment later 22 2.1 7 Transported to a medical facility-unknown if treated 3 0.3 8 Treatment -other (specify) 9 0.8 9 Unknown Variable Name Format Type Length ML4211F Numeric 8 OCCFatality Definition: Documents if there were any occupant fatalities in the case. N Prcnt Code Label 850 79.4 0 Not Fatal 206 19.3 1 Fatal 12 1.1 2 Fatal -ruled disease (specify) 2 0.2 9 Unknown LTCCS Codebook Crash Data Set • 47 Codebook - Crash Data Set Variable Name CRAAlcohol Format ML642F Type Numeric Length 8 Definition: Documents whether or not alcohol was involved in the crash. N Prcnt Code Label 91 8.5 1 Yes 852 79.6 2 No 127 11.9 9 Unknown Variable Name AnyDrugsCrash Format ML642F Type Numeric Length 8 Definition: Documents whether or not any drugs (legal or illegal) were present or involved in the crash. N Prcnt Code Label 610 57.0 1 Yes 460 43.0 2 No LTCCS Codebook Crash Data Set • 48 Codebook - CrashAssessment Data Set CrashAssessment Data Set 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 CrashAssessment 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 CrashAssessment data set with other vehicle level data sets. Format Type Length Variable Name ML657F Numeric 8 PreEventMovement Definition: Establishes the subject vehicle’s pre-critical event movement pattern. The pre-event movement pattern is usually described as the point which both precedes the critical precrash envelope and which precedes vehicle motions that place the involved vehicle(s) on an imminent collision path. N Prcnt Code Label 24 1.1 0 No driver present 1,141 50.0 1 Going Straight 155 6.8 2 Decelerating in traffic lane 33 1.4 3 Accelerating in traffic lane 14 0.6 4 Starting in traffic lane 296 13.0 5 Stopped in traffic lane 53 2.3 6 Passing or overtaking another vehicle 3 0.1 7 Disabled or parked in travel lane 15 0.7 10 Turning right 36 1.6 11 Turning left 3 0.1 12 Making a U-turn 7 0.3 13 Backing up (other than for parking position) 274 12.0 14 Negotiating a curve 86 3.8 15 Changing lanes 17 0.7 16 Merging 63 2.8 17 Successful avoidance maneuver to a previous critical event 26 1.1 98 Other (specify) 38 1.7 99 Unknown Format Type Length Variable Name ML654F Numeric 8 ACRCriticalEvent Definition: Identifies the event which made the crash imminent (i.e. something occurred which made the collision inevitable). A precrash critical event is coded for each vehicle in the crash and documents the circumstances leading to this vehicle’s first impact in the crash sequence. N Prcnt Code Label 13 0.6 1 Blow out/flat tire, (specify blow out/flat,location/make) 7 0.3 3 Disabling vehicle failure (e.g, wheel fell off) Specify: 5 0.2 4 Non-disabling vehicle problem (e.g., hood flew up) Specify: LTCCS Codebook CrashAssessment Data Set • 49 Codebook - CrashAssessment Data Set N Prcnt Code Label 16 0.7 5 Poor road conditions(Puddle,pot hole,ice,etc.) Specify: 122 5.3 6 Traveling too fast for conditions 12 0.5 7 Jacknife Event 26 1.1 8 Other cause of control loss (specify) 13 0.6 9 Unknown cause of control loss 131 5.7 10 Over the lane line on left side of travel lane 63 2.8 11 Over the lane line on right side of travel lane 42 1.8 12 Off the edge of the road on the left side 83 3.6 13 Off the edge of the road on the right side 1 0.0 14 End departure 76 3.3 15 Turning left at intersection 22 1.0 16 Turning right at interesection 76 3.3 17 Crossing over (passing through) intersection 7 0.3 18 This vehicle decelerating 119 5.2 50 Other vehicle stopped 79 3.5 51 Travelling in same direction with low steady speed 82 3.6 52 Travelling in same direction while decelerating 252 11.0 53 Traveling in same direction with higher speed 30 1.3 54 Traveling in opposite direction 2 0.1 55 In crossover 2 0.1 56 Backing 1 0.0 59 Unknown travel direction of other motor vehicle in lane 91 4.0 60 From adjacent lane (same direction) -over left lane line 95 4.2 61 From adjacent lane (same direction -over right lane line 110 4.8 62 From opposite direction-over left lane line 2 0.1 63 From opposite direction -over right lane line 4 0.2 65 From crossing street, turning into same direction 68 3.0 66 From crossing street, across path 22 1.0 67 From crossing street ,turning into opposite direction 2 0.1 70 From driveway,turning into same direction 4 0.2 71 From driveway, across path 5 0.2 72 From driveway, turning into oppsite direction 1 0.0 74 From enterance to limited access highway 26 1.1 80 Pedestrian in roadway 1 0.0 81 Pedestrain approaching roadway 7 0.3 83 Pedalcyclist or other nonmotorist in roadway (specify): 1 0.0 87 Animal in roadway 16 0.7 90 Object in roadway 41 1.8 98 Other (Specify) 14 0.6 100 Cargo Shift 492 21.5 125 Not involved first harmful event LTCCS Codebook CrashAssessment Data Set • 50 Codebook - CrashAssessment Data Set Format Type Length Variable Name ML4123F Numeric 8 CriticalEventCat Definition: Groups the individual attributes of the Critical Precrash Event into categories. These categories are helpful in deciding the critical precrash event. N Prcnt Code Label 228 10.0 1 This vehicle loss of control 501 21.9 2 This vehicle traveling 567 24.8 3 Other motor vehicle in lane 404 17.7 4 Other motor vehicle encroaching into lane 34 1.5 5 Pedestrian, pedacyclist, or other nonmotorist 17 0.7 6 Object or animal 41 1.8 7 Other (specify) 492 21.5 9 This vehicle not involved in first harmful event Format Type Length Variable Name ML655F Numeric 8 ACRReason Definition: Establishes the critical reason for the occurrence of the critical event. The critical reason is the immediate reason for this event and is often the last failure in the causal chain (i.e. closest in time to the critical precrash event). Although the critical reason is an important part of the description of crash events, it is not the cause of the crash nor does it imply the assignment of fault. N Prcnt Code Label 1,229 53.8 0 Critical event not coded to this vehicle 59 2.6 100 Sleep, that is, actually asleep 40 1.8 101 Heart attack or other physical impairment of the ability to act 3 0.1 108 Other critical non-performance (specify) 6 0.3 109 Unknown critical non-performance 59 2.6 110 Inattention (i.e., daydreaming) 43 1.9 111 Internal distraction 28 1.2 112 External distraction 138 6.0 113 Inadequate surveillance (e.g., failed to look, looked but did not 3 0.1 118 Other recognition error (specify) 53 2.3 119 Unknown recognition error 69 3.0 120 Too fast for conditions to be able to respond to unexpected 2 0.1 121 Too slow for traffic stream 36 1.6 122 Misjudgment of gap or other's speed 34 1.5 123 Following too closely to respond to unexpected actions 22 1.0 124 False assumption of other road user's actions 44 1.9 125 Illegal maneuver 6 0.3 127 Inadequate evasive action, e.g. braking only, not braking and 23 1.0 128 Aggressive driving behavior 20 0.9 138 Other decision error (specify) 3 0.1 139 Unknown decision error LTCCS Codebook CrashAssessment Data Set • 51 Codebook - CrashAssessment Data Set N Prcnt Code Label 63 2.8 140 Too fast for curve/turn 1 0.0 141 Panic/Freezing 40 1.8 142 Overcompensation 38 1.7 143 Poor directional control e.g., failing to control vehicle with skill 2 0.1 149 Unknown performance error 98 4.3 199 Type of driver error unknown 16 0.7 200 Tires/wheels failed 8 0.4 201 Brakes failed 1 0.0 202 Steering failed 17 0.7 203 Cargo shifted 1 0.0 204 Trailer attachment failed 2 0.1 205 Suspension failed 1 0.0 208 Body, doors, hood failed 2 0.1 298 Other vehicle failure (specify) 1 0.0 299 Unknown vehicle failures 1 0.0 500 Signs/signals missing 1 0.0 504 View obstructed by other vehicles 1 0.0 505 Road design -roadway geometry (e.g., ramp curvature) 1 0.0 507 Road design -other 20 0.9 509 Slick roads (low friction road surface due to ice, loose debris, any 1 0.0 518 Other highway-related condition (specify) 1 0.0 522 Fog 2 0.1 523 Wind gust 7 0.3 530 Glare 18 0.8 540 Degraded braking capability 3 0.1 541 Transmission/engine failure 17 0.7 999 Unknown reason for critical event Variable Name Format Type Length OT1F Numeric 8 ReasonCat Definition: Groups the attributes for the variable Critical Reason for the Critical Event variable into categories. N Prcnt Code Label 1,229 53.8 0 No Driver Error 108 4.7 Physical Driver Factor 324 14.2 Driver Recognition Factor 322 14.1 Driver Decision Factor 179 7.8 Driver Performance Factor 70 3.1 Vehicle Related Factor 25 1.1 Environment -Highway LTCCS Codebook CrashAssessment Data Set • 52 Codebook - CrashAssessment Data Set N Prcnt Code Label 10 0.4 7 Environment -Weather 17 0.7 99 Unknown Reason Variable Name Format Type Length ML656F Numeric 8 ACRAvoidance Definition: Documents the driver’s actions initiated in response to the realization of impending danger. Attempted avoidance maneuvers are movements/actions initiated by the subject driver, within the crucial crash envelope, in response to a critical precrash event. Attempted avoidance maneuvers occur after the driver has realization of an impending danger. N Prcnt Code Label 24 1.1 0 No driver present 1,219 53.4 1 No avoidance maneuver 137 6.0 2 Braking (no lockup) 219 9.6 3 Braking (lockup) 13 0.6 4 Braking (lockup unknown) 61 2.7 6 Steering left 72 3.2 7 Steering right 106 4.6 8 Braking and steering left 128 5.6 9 Braking and steering right 21 0.9 10 Accelerating 8 0.4 11 Accelerating and steering left 10 0.4 12 Accelerating and steering right 115 5.0 98 Other action (specify) 151 6.6 99 Unknown Format Type Length Variable Name ML659F Numeric 8 ACRStability Definition: Focuses upon this vehicle’s dynamics after the critical event. The purpose of this variable is to assess the stability of the vehicle after the critical event. The stability of the vehicle prior to an avoidance action is not considered except in the following situation: A vehicle that is out of control (e.g. yawing clockwise) prior to an avoidance maneuver is coded “Other vehicle loss of control” only if an avoidance action was taken in response to an impending danger. N Prcnt Code Label 24 1.1 0 No driver present 1,644 72.0 1 Tracking 368 16.1 2 Skidding longitudinally->rotation less than 30 degrees 59 2.6 3 Skidding laterally->clockwise rotation 72 3.2 4 Skidding laterally->counterclockwise rotation 47 2.1 8 Other vehicle loss-of-control (specify) 70 3.1 9 Pre-crash stability unknown LTCCS Codebook CrashAssessment Data Set • 53 Codebook - CrashAssessment Data Set Format Type Length Variable Name ML658F Numeric 8 ACRLocation Definition: Reports the location of the subject vehicle at the point where its pre-impact stability is determined. N Prcnt Code Label 24 1.1 0 No driver present 1,431 62.7 1 Stayed in original travel lane 521 22.8 2 Stayed on roadway but left original travel lane 10 0.4 3 Stayed on roadway, not known if left original travel lane 221 9.7 4 Departed roadway 11 0.5 5 Remained off roadway 24 1.1 6 Returned to roadway 13 0.6 7 Entered roadway 29 1.3 9 Unknown Format Type Length Variable Name ML660F Numeric 8 ACRRightOfWay Definition: Establishes vehicle right-of-way characteristics, from a legal perspective, for the subject vehicle. Specifically, did this vehicle have the right-of-way? N Prcnt Code Label 581 25.4 1 Yes 401 17.6 2 No 1,295 56.7 88 Not Applicable 7 0.3 99 Unknown Format Type Length Variable Name BEST8 Numeric 8 CrashCode Definition: Used in categorizing the collisions of drivers involved in crashes. A collision is defined here as the first harmful event in a crash between a vehicle and some object, accompanied by property damage or human injury. The object may be another vehicle, a person, an animal, a fixed object, the road surface, or the ground. If the first collision is a rollover, the impact is with the ground or road surface. The collision may also involve plowing into soft ground, if severe deceleration results in damage or injury. A road departure without damage or injury is not defined as a collision. This variable encompasses the “Configuration” variable, which is a component of this variable. N Prcnt Code Label 18 0.8 0 0 65 2.8 1 1 43 1.9 2 2 6 0.3 3 3 1 0.0 5 5 LTCCS Codebook CrashAssessment Data Set • 54 Codebook - CrashAssessment Data Set N Prcnt Code Label 38 1.7 6 6 54 2.4 7 7 6 0.3 8 8 1 0.0 9 9 2 0.1 10 10 2 0.1 11 11 3 0.1 12 12 32 1.4 13 13 1 0.0 14 14 8 0.4 15 15 113 4.9 20 20 106 4.6 21 21 7 0.3 22 22 1 0.0 23 23 90 3.9 24 24 85 3.7 25 25 2 0.1 26 26 2 0.1 27 27 61 2.7 28 28 53 2.3 29 29 1 0.0 30 30 7 0.3 31 31 32 1.4 32 32 2 0.1 33 33 4 0.2 42 42 1 0.0 43 43 7 0.3 44 44 105 4.6 45 45 49 2.1 46 46 53 2.3 47 47 54 2.4 48 48 35 1.5 50 50 35 1.5 51 51 10 0.4 52 52 10 0.4 62 62 45 2.0 64 64 45 2.0 65 65 14 0.6 66 66 38 1.7 68 68 38 1.7 69 69 10 0.4 70 70 10 0.4 71 71 10 0.4 72 72 LTCCS Codebook CrashAssessment Data Set • 55 Codebook - CrashAssessment Data Set N Prcnt Code Label 10 0.4 73 73 2 0.1 74 74 4 0.2 76 76 4 0.2 77 77 5 0.2 78 78 5 0.2 79 79 4 0.2 80 80 4 0.2 81 81 30 1.3 82 82 30 1.3 83 83 2 0.1 84 84 31 1.4 86 86 31 1.4 87 87 38 1.7 88 88 38 1.7 89 89 6 0.3 90 90 7 0.3 92 92 4 0.2 93 93 614 26.9 98 98 Variable Name Format Type Length AccidentCat OT2F Numeric 8 Definition: Used in categorizing the collisions of drivers involved in crashes. A collision is defined here as the first harmful event in a crash between a vehicle and some object, accompanied by property damage or human injury. The object may be another vehicle, a person, an animal, a fixed object, the road surface, or the ground. If the first collision is a rollover, the impact is with the ground or road surface. The collision may also involve plowing into soft ground, if severe deceleration results in damage or injury. A road departure without damage or injury is not defined as a collision. This variable is part of the larger variable “Crash Type.” The “Crash Type” variable is actually broken down into three components: the crash category, the crash configuration, and the accident type. This variable only deals with the configuration of the crash. N Prcnt Code Label 115 5.0 1 Right Roadside Departure 562 24.6 2 Rear-End 80 3.5 3 Head-On 118 5.2 4 Turn Across Path 144 6.3 5 Straight Paths 104 4.6 6 Same Trafficway Opposite Directions -Sideswipe/Angle 101 4.4 7 Left Roadside Departure 5 0.2 8 Same Trafficway Same Direction -Forward Impact 10 0.4 9 Same Trafficway Opposite Directions -Forward Impact 88 3.9 10 Turn Into Path 46 2.0 11 Single Driver -Forward Impact LTCCS Codebook CrashAssessment Data Set • 56 Codebook - CrashAssessment Data Set N Prcnt Code Label 268 11.7 12 Same Trafficway Same Direction -Sideswipe/Angle 643 28.2 13 Miscellaneous Variable Name Format Type Length AP1U Numeric 8 ACRJackknife Definition: Documents the presence/absence of a jackknife for this vehicle. N Prcnt Code Label 2,223 97.3 0 Absent 61 2.7 1 Present Variable Name ACRCargoshift Format AP1U Type Numeric Length 8 Definition: Documents the presence/absence of a cargo shift for this vehicle. N Prcnt Code Label 2,241 98.1 0 Absent 43 1.9 1 Present LTCCS Codebook CrashAssessment Data Set • 57 Codebook - CrashDiscussion Data Set CrashDiscussion Data Set 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 CrashDiscussion 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 CrashDiscussion data set with other vehicle level data sets. Format Type Length Variable Name $21000 Char 21000 Discussion Definition: The Case Summary is intended to provide a detailed description of the crash sequence including precrash vehicle movement patterns and driver precrash actions. In addition to describing crash events for each vehicle/driver, the summary is intended to provide a detailed accounting of all causal-related information for this vehicle/driver. This includes describing the critical precrash event, the critical reason for the critical event, and all critical event associated factors. N Prcnt Code Label 1 0.0 * . Vehicle 1 was a 1988 Ford LTD Crown Victoria with 3 1 0.0 * 1999 Toyota Tacoma pickup truck The driver of the 1999 Toyota 1 0.0 * A 2001 Freightliner Towing a van semi-trailer (Vehicle 2) and a 1 0.0 * A 2001 Freightliner Towing a van semi-trailer (Vehicle 2) and a 1 0.0 * A 2001 Mitsubishi Eclipse, vehicle one, was traveling south on a 1 0.0 * A 2001 Mitsubishi Eclipse, vehicle one, was traveling south on a 1 0.0 * A 3-vehicle collision occurred in mid June at approximately 1700 1 0.0 * A 3-vehicle collision occurred in mid June at approximately 1700 1 0.0 * A 3-vehicle collision occurred in mid June at approximately 1700 1 0.0 * A collision involving four vehicles occurred at 1040 hours on an ------------------------------ 1 0.0 * Vehicle two is a 1998 Pontiac Grand Prix. Vehicle two was 1 0.0 * Vehicle two was a 1983 Peterbilt conventional tractor with a 1 0.0 * Vehicle two was a 1994 Ford medium/heavy flatbed straight 1 0.0 * Vehicle two was a 1995 Western Star truck with a flat bed trailer 1 0.0 * Vehicle two was a 2001 Freightliner F80 straight truck with a 1 0.0 * Vehicle two, a 1989 Freightliner pulling one trailer, was traveling 1 0.0 * Vehicle two, a 1995 Ford L8000 two-axle straight truck, traveling 1 0.0 * Vehicle two, a 1999 Peterbilt tractor with one refrigerated van 1 0.0 * Vehicle two, a 1999 single unit straight truck, was negotiating a 1 0.0 * Vehicle two, a 1999 single unit straight truck, was negotiating a Note: Asterisk in code column indicates that the stored value is the same as the value in the label column. LTCCS Codebook CrashDiscussion Data Set • 58 Codebook - DMVViolation Data Set DMVViolation Data Set 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 DMVViolation data set contains the variables CaseID, PSU, PSUStrat, RATWeight, VehicleNumber and DriverNumber. CaseID and VehicleNumber should be used to merge the DMVViolation data set with vehicle level data sets. DriverNumber is used to uniquely identify each driver, however, since a driver can have more than one violation and be involved in more than one crash, this variable does not uniquely identify each record. Variable Name Format Type Length BEST8 Numeric 8 ViolationNumber Definition: Identifies the violation number. N Prcnt Code Label 983 20.9 1 1 728 15.4 2 2 550 11.7 3 3 437 9.3 4 4 350 7.4 5 5 285 6.0 6 6 235 5.0 7 7 189 4.0 8 8 148 3.1 9 9 121 2.6 10 10 ------------------------------ 5 0.1 29 29 4 0.1 30 30 3 0.1 31 31 3 0.1 32 32 2 0.0 33 33 1 0.0 34 34 1 0.0 35 35 1 0.0 36 36 1 0.0 37 37 1 0.0 38 38 LTCCS Codebook DMVViolation Data Set • 59 Codebook - DMVViolation Data Set Format Type Length Variable Name $2 Char 2 LicState Definition: Identifies the State in which the driver’s (driving) license was issued. N Prcnt Code Label 567 12.0 * AL 1 0.0 * AR 129 2.7 * CA 280 5.9 * CO 8 0.2 * DE 334 7.1 * FL 135 2.9 * GA 10 0.2 * IA 3 0.1 * ID 68 1.4 * IL 195 4.1 * IN 3 0.1 * KS 4 0.1 * KY 11 0.2 * LA 13 0.3 * MA 263 5.6 * MD 7 0.1 * ME 292 6.2 * MI 15 0.3 * MN 1 0.0 * MO 13 0.3 * MS 2 0.0 * MT 442 9.4 * NC 27 0.6 * NE 456 9.7 * NJ 15 0.3 * NM 1 0.0 * NV 188 4.0 * NY 120 2.5 * OH 25 0.5 * OK 9 0.2 * OR 388 8.2 * PA 80 1.7 * SC 189 4.0 * TN 222 4.7 * TX 1 0.0 * UK 12 0.3 * UT LTCCS Codebook DMVViolation Data Set • 60 Codebook - DMVViolation Data Set N Prcnt Code Label 14 0.3 * VA 140 3.0 * WA 12 0.3 * WI 10 0.2 * WV 7 0.1 * WY Note: Asterisk in code column indicates that the stored value is the same as the value in the label column. Format Type Length Variable Name $10 Char 10 CitDate Definition: Identifies the date that the driver received a citation for a particular violation. N Prcnt Code Label 1 0.0 * 1962-04-01 1 0.0 * 1963-11-01 1 0.0 * 1965-03-01 1 0.0 * 1965-05-01 1 0.0 * 1966-02-01 1 0.0 * 1966-08-01 1 0.0 * 1967-11-01 2 0.0 * 1968-06-01 1 0.0 * 1969-09-01 1 0.0 * 1969-10-01 ------------------------------ 8 0.2 * 2003-04-01 21 0.4 * 2003-05-01 22 0.5 * 2003-06-01 15 0.3 * 2003-07-01 11 0.2 * 2003-08-01 6 0.1 * 2003-09-01 16 0.3 * 2003-10-01 6 0.1 * 2003-11-01 5 0.1 * 2003-12-01 3 0.1 * 9999-99-99 Note: Asterisk in code column indicates that the stored value is the same as the value in the label column. LTCCS Codebook DMVViolation Data Set • 61 Codebook - DMVViolation Data Set Format Type Length Variable Name $10 Char 10 ConvDate Definition: Identifies the date that the driver was convicted of a particular violation. N Prcnt Code Label 1 0.0 * 1963-12-01 1 0.0 * 1965-03-01 1 0.0 * 1965-07-01 1 0.0 * 1966-02-01 1 0.0 * 1966-09-01 1 0.0 * 1967-12-01 1 0.0 * 1968-06-01 1 0.0 * 1968-07-01 1 0.0 * 1969-10-01 1 0.0 * 1969-11-01 ------------------------------ 22 0.5 * 2003-09-01 20 0.4 * 2003-10-01 11 0.2 * 2003-11-01 10 0.2 * 2003-12-01 6 0.1 * 2004-01-01 11 0.2 * 2004-02-01 11 0.2 * 2004-03-01 2 0.0 * 2004-05-01 1 0.0 * 2004-07-01 24 0.5 * 9999-99-99 Note: Asterisk in code column indicates that the stored value is the same as the value in the label column. Format Type Length Variable Name $5 Char 5 ACDcode Definition: Represents Department Of Motor Vehicle (DMV) violation codes. N Prcnt Code Label 635 13.5 * 1 0.0 * ??? 4 0.1 * A04 2 0.0 * A08 15 0.3 * A10 1 0.0 * A11 5 0.1 * A12 49 1.0 * A20 44 0.9 * A21 LTCCS Codebook DMVViolation Data Set • 62 Codebook - DMVViolation Data Set N Prcnt Code Label 2 0.0 * A22 ------------------------------ 83 1.8 * S94 2 0.0 * S95 30 0.6 * S96 1 0.0 * SC2 1 0.0 * SP 3 0.1 * SP3 5 0.1 * U01 1 0.0 * U07 1 0.0 * U25 10 0.2 * W10 Note: Asterisk in code column indicates that the stored value is the same as the value in the label column. Variable Name Format Type Length $75 Char 75 ACDdetail Definition: The 5-digit code that provides further detail of the ACD code. N Prcnt Code Label 2,788 59.2 * 103 2.2 * 0 1 0.0 * 00 167 3.5 * 00000 1 0.0 * 00054 1 0.0 * 05015 2 0.0 * 05021 1 0.0 * 15020 1 0.0 * 19 1 0.0 * 20030 ------------------------------ 8 0.2 * S11 21 0.4 * S15 1 0.0 * S16 15 0.3 * S51 28 0.6 * S61 2 0.0 * S71 79 1.7 * S93 13 0.3 * S94 2 0.0 * S95 2 0.0 * U06 Note: Asterisk in code column indicates that the stored value is the same as the value in the label column. LTCCS Codebook DMVViolation Data Set • 63 Codebook - DMVViolation Data Set Format Type Length Variable Name BEST8 Numeric 8 DriverNumber Definition Uniquely identifies each driver, however, since a driver can have more than one violation and be involved in more than one crash, this variable does not uniquely identify each record. N Prcnt Code Label 1 0.0 1 1 1 0.0 6 6 1 0.0 7 7 4 0.1 10 10 5 0.1 13 13 1 0.0 14 14 3 0.1 15 15 1 0.0 18 18 4 0.1 19 19 13 0.3 20 20 ------------------------------ 1 0.0 11319 11319 5 0.1 11320 11320 2 0.0 11322 11322 6 0.1 11338 11338 13 0.3 11339 11339 3 0.1 11343 11343 1 0.0 11351 11351 1 0.0 11352 11352 1 0.0 11356 11356 1 0.0 11359 11359 Format Type Length Variable Name $75 Char 75 ViolDescription Definition: Describes each violation and corresponds to the ACD Code. N Prcnt Code Label 646 13.7 * 33 0.7 * "EXCEED/VIOLATING SIZE, WEIGHT,/PASSENGER//CARGO 1 0.0 * "FT OBEY RAILROAD GATES,SIGNS/SIGNALS" 2 0.0 * "IMPR LANE/LOCATION -ROAD SHOULDER, 42 0.9 * "MISSING,DEFACED,/OBSCURED LIC PLATES" 1 0.0 * "MV IN MANUFACTUR,DISTRIBUTE,/DISPENSE A 2 0.0 * "RECKLESS, CARELESS,/NEGLIGENT DRIVE" 21 0.4 * "SHOW/USE IMPROPERLY-REG,PLATES,DECAL/STICKER" 21 0.4 * "SPILLING, DRAGGING, UNSECURED/UNSAFE LOAD" 15 0.3 * "STOP,STAND,/PARK WHERE PROHIBITED/IMPROPER" LTCCS Codebook DMVViolation Data Set • 64 Codebook - DMVViolation Data Set N Prcnt Code Label ------------------------------ 1 0.0 * TOWING/PUSHING VEH IMPROPERLY 1 0.0 * TRANSPORTING LIQUOR ILLEGALLY 1 0.0 * UNAUTH USE OF A VEH/TAKE VEH W/O OWNER CONSENT 51 1.1 * UNSAFE CONDITION OF VEH 96 2.0 * UNSAFE OPERATION 10 0.2 * USE OF EQUIP PROHIBITED BY LAW 3 0.1 * USE OF RADAR/LASER DETECTOR PROHIBITED BY LAW 1 0.0 * VEH HOMICIDE 6 0.1 * VIOLATE RESTRICTIONS OF DRIVER LIC 10 0.2 * WITHDRAWAL (REASON NOT SPECIFIED) Note: Asterisk in code column indicates that the stored value is the same as the value in the label column. LTCCS Codebook DMVViolation Data Set • 65 Codebook - DriverAssessment Data Set DriverAssessment Data Set 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 DriverAssessment 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 DriverAssessment data set with other vehicle level data sets. Format Type Length Variable Name ML867F Numeric 8 SightLine Definition: Establishes the driver’s sight line to the other vehicle in terms of being clear or being obstructed in some manner. N Prcnt Code Label 1,957 85.7 1 Yes 12 0.5 2 No, view obstructed by roadway curvature or grade 5 0.2 3 No, view obstructed by roadside appurtenance 42 1.8 4 No, view obstructed by intervening vehicle 225 9.9 7 Not applicable 23 1.0 8 Other (specify) 20 0.9 9 Unknown Format Type Length Variable Name ML730F Numeric 8 Obscured Definition: Establishes the driver’s view of the other vehicle in terms of having a clear view or having a view that is obscured in some manner. N Prcnt Code Label 5 0.2 1 Yes, obscured by solar glare 1 0.0 2 Yes, obscured by headlight glare 20 0.9 4 Yes, obscured by dark (nighttime) viewing conditions 1,960 85.8 5 No 222 9.7 7 Not applicable 50 2.2 8 Yes, obscured by other condition (specify) 26 1.1 9 Unknown LTCCS Codebook DriverAssessment Data Set • 66 Codebook - DriverAssessment Data Set Format Type LengthVariable Name ML748F Numeric 8 Definition: Establishes if this driver is required to stop prior to entering an intersection, initiating a StopRequired turn, or prior to the crash. N Prcnt Code Label 247 10.8 1 Yes, traffic control device (TCD) 203 8.9 2 Yes, other reason (specify) 76 3.3 3 Yes, yield right of way requirement 1,726 75.6 5 No 24 1.1 7 No driver present 8 0.4 9 Unknown Format Type Length Variable Name ML749F Numeric 8 TimeStopped Definition: Establishes the period of time the driver was stopped prior to entering an intersection, initiating a turn, or prior to the crash. N Prcnt Code Label 105 4.6 0 Traveling at constant velocity 130 5.7 1 Decelerated, did not stop 9 0.4 2 Rolling stop prior to proceeding 8 0.4 3 Stopped < 1 second prior to proceeding 13 0.6 4 Stopped 1-2 seconds prior to proceeding 18 0.8 5 Stopped 3-5 seconds prior to proceeding 132 5.8 6 Stopped more then 5 seconds prior to proceeding 24 1.1 7 No driver present 1,734 75.9 8 Not required to stop 111 4.9 9 Unknown Format Type Length Variable Name ML729F Numeric 8 Focused Definition: Documents the circumstance where the driver focuses on an extraneous location after initially checking for approaching traffic. N Prcnt Code Label 176 7.7 1 Yes (specify) 616 27.0 2 No 1,124 49.2 7 Not applicable 368 16.1 9 Unknown LTCCS Codebook DriverAssessment Data Set • 67 Codebook - DriverAssessment Data Set Format Type Length Variable Name AP1U Numeric 8 ADRWorkSchedule Definition: Establishes whether or not the driver’s sleep pattern is primarily related to his/her work schedule. (This variable was originally an attribute choice under the variable “Driver’s Hours of Main Sleep Related To.”) N Prcnt Code Label 838 36.7 0 Absent 1,446 63.3 1 Present Variable Name Format Type Length AP1U Numeric 8 SocialSchedule Definition: Establishes whether or not the driver’s sleep pattern is related to a social schedule. (This variable was originally an attribute choice under the variable “Driver’s Hours Of Main Sleep Related To.”) N Prcnt Code Label 2,137 93.6 0 Absent 147 6.4 1 Present Format Type Length Variable Name AP1U Numeric 8 PersonalProblems Definition: Establishes whether or not the driver’s sleep pattern is primarily related to a set of personal problems. (This variable was originally an attribute choice under the variable “Driver’s Hours Of Main Sleep Related To.”) N Prcnt Code Label 2,281 99.9 0 Absent 3 0.1 1 Present Variable Name Format Type Length AP1U Numeric 8 FamilyProblems Definition: Establishes whether or not the driver’s sleep pattern is related to problems of other family members or to interpersonal relationships between the driver and other family members. (This variable was originally an attribute choice under the variable “Driver’s Hours Of Main Sleep Related To.”) N Prcnt Code Label 2,278 99.7 0 Absent 6 0.3 1 Present LTCCS Codebook DriverAssessment Data Set • 68 Codebook - DriverAssessment Data Set Format Type Length Variable Name AP1U Numeric 8 Illness Definition: Establishes whether or not the driver’s sleep pattern is related to illness. The illness may involve either the driver or other family members. (This variable was originally an attribute choice under the variable “Driver’s Hours Of Main Sleep Related To.”) N Prcnt Code Label 2,273 99.5 0 Absent 11 0.5 1 Present Variable Name Format Type Length AP1U Numeric 8 NoDriverPresent Definition: Establishes whether or not there was a driver present in the driver’s seated position at the time of the crash. (This variable was originally an attribute choice under the variable “Driver’s Hours Of Main Sleep Related To.”) N Prcnt Code Label 2,259 98.9 0 Absent 25 1.1 1 Present Format Type Length Variable Name AP1U Numeric 8 ADROtherFactor Definition: Establishes whether or not the driver’s sleep pattern is related to a factor not described by the other sleep pattern variables. (This variable was originally an attribute choice under the variable “Driver’s Hours Of Main Sleep Related To” and was the “Other (specify):” attribute choice.) N Prcnt Code Label 2,234 97.8 0 Absent 50 2.2 1 Present Variable Name Format Type Length AP1U Numeric 8 UnknownFactor Definition: Establishes whether or not the driver’s sleep pattern was related to an unknown factor. (This variable was originally an attribute choice under the variable “Driver’s Hours Of Main Sleep Related To” and was the “Unknown” attribute choice.) N Prcnt Code Label 1,655 72.5 0 Absent 629 27.5 1 Present LTCCS Codebook DriverAssessment Data Set • 69 Codebook - DriverAssessment Data Set Format Type Length Variable Name ML869F Numeric 8 AlcoholUse Definition: Establishes the presence of alcohol for this driver. N Prcnt Code Label 2,040 89.3 0 No alcohol use 63 2.8 91 AC test performed, results positive 22 1.0 92 Field observation of NASS researcher 16 0.7 93 AC test performed, results negative 10 0.4 96 None given 82 3.6 97 AC test performed, results unknown 24 1.1 98 No driver present 27 1.2 99 Unknown Format Type Length Variable Name OT64F Numeric 8 AlcoholTest Definition: Records the results of an alcohol test (either blood alcohol test or Breathalyzer test) in percent times 100. N Prcnt Code Label 464 20.3 0 0 1 0.0 1 1 1 0.0 3 3 1 0.0 10 10 1 0.0 15 15 1 0.0 16 16 1 0.0 40 40 1 0.0 60 60 1 0.0 68 68 1 0.0 70 70 2 0.1 76 76 1 0.0 79 79 1 0.0 80 80 2 0.1 100 100 1 0.0 107 107 2 0.1 110 110 1 0.0 118 118 3 0.1 120 120 1 0.0 129 129 2 0.1 130 130 1 0.0 140 140 2 0.1 150 150 1 0.0 160 160 LTCCS Codebook DriverAssessment Data Set • 70 Codebook - DriverAssessment Data Set N Prcnt Code Label 3 0.1 170 170 1 0.0 180 180 1 0.0 190 190 1 0.0 193 193 1 0.0 198 198 1 0.0 200 200 4 0.2 210 210 3 0.1 220 220 1 0.0 221 221 1 0.0 223 223 1 0.0 228 228 3 0.1 230 230 1 0.0 240 240 1 0.0 252 252 1 0.0 254 254 1 0.0 264 264 1 0.0 280 280 1 0.0 290 290 1 0.0 292 292 2 0.1 320 320 1 0.0 321 321 1 0.0 350 350 1 0.0 362 362 1 0.0 369 369 24 1.1 8887 No driver present 1,593 69.7 9998 None 140 6.1 9999 Unknown Variable Name Format Type Length ML3451F Numeric 8 TestSource Definition: Documents the source of the BAC test results. N Prcnt Code Label 1,559 68.3 0 No BAC test/Not applicable 215 9.4 1 Police reported 84 3.7 2 Company reported 24 1.1 6 No driver present 377 16.5 8 Other (specify) 25 1.1 9 Unknown LTCCS Codebook DriverAssessment Data Set • 71 Codebook - DriverAssessment Data Set Format Type Length Variable Name $OT65F Char 5 TestDelay Definition: Documents the time delay between the crash and the time the BAC test is administered. N Prcnt Code Label 9 0.4 * 00:00 1 0.0 * 00:25 1 0.0 * 00:28 1 0.0 * 00:29 2 0.1 * 00:30 1 0.0 * 00:31 1 0.0 * 00:33 2 0.1 * 00:36 1 0.0 * 00:37 1 0.0 * 00:39 ------------------------------ 1 0.0 * 39:14 1 0.0 * 47:10 1 0.0 * 55:00 1 0.0 * 58:48 1 0.0 * 68:12 1 0.0 * 68:30 1 0.0 * 70:30 24 1.1 97:97 No driver present 1,632 71.5 98:98 No BAC Test 325 14.2 99:99 Unknown Note: Asterisk in code column indicates that the stored value is the same as the value in the label column. Format Type Length Variable Name ML870F Numeric 8 ADRDrugTest Definition: Documents the administration of a drug test for this driver. N Prcnt Code Label 575 25.2 0 No drug use 267 11.7 5 Test performed, results negative 86 3.8 91 Test performed, results positive 1,207 52.8 96 None given 81 3.5 97 Test performed, results unknown 24 1.1 98 No driver present 44 1.9 99 Unknown LTCCS Codebook DriverAssessment Data Set • 72 Codebook - DriverAssessment Data Set Format Type Length Variable Name ML662F Numeric 8 Fatigue Definition: Assesses driver fatigue at the time of the crash. The assessment is based on an evaluation of the driver’s current and preceding sleep schedules, current and preceding work schedules, and a variety of other fatigue-related factors including recreational and non-work activities. N Prcnt Code Label 1,374 60.2 0 Driver not fatigued 216 9.5 1 Driver fatigued 24 1.1 8 No driver present 670 29.3 9 Unknown if driver fatigued Variable Name Format Type Length ML752F Numeric 8 Upset Definition: Establishes whether or not the driver was upset prior to the crash and the specific reason for this emotional state. N Prcnt Code Label 1,543 67.6 0 Not upset 8 0.4 1 Preceding argument with spouse 4 0.2 2 Preceding argument with other family member 12 0.5 3 Preceding argument with other individual (specify) 7 0.3 4 Related to financial problems 9 0.4 5 Related to family problems 24 1.1 7 No driver present 17 0.7 8 Other source (specify) 660 28.9 9 Unknown Variable Name Format Type Length ML732F Numeric 8 Hurrying Definition: Establishes if the driver was in a hurry prior to crash occurrence. Assessments of this type are reflected in the driver’s precrash driving behavior (e.g. speeding, sudden starts/stops, weaving in and out of traffic, etc.) N Prcnt Code Label 1,523 66.7 0 Not in a hurry 21 0.9 1 Due to work-related schedule 4 0.2 2 Late for business appointment 5 0.2 3 Late for social appointment 13 0.6 4 Late for start of work shift/start of school classes 3 0.1 5 Normal driving pattern 24 1.1 7 No driver present LTCCS Codebook DriverAssessment Data Set • 73 Codebook - DriverAssessment Data Set N Prcnt Code Label 24 1.1 8 Other reason (specify) 667 29.2 9 Unknown Variable Name Format Type Length Emotional ML865F Numeric 8 Definition: Establishes if there were other emotional factors relevant to this driver’s precrash behavior. N Prcnt Code Label 1,556 68.1 0 No other emotional factors 18 0.8 1 Driver clinically depressed 9 0.4 2 Driver has a diagnosed psychosis (specify) 24 1.1 7 No driver present 23 1.0 8 Other factors (specify) 654 28.6 9 Unknown Variable Name Format Type Length ML753F Numeric 8 KnewVehicle Definition: Establishes driver familiarity with the vehicle being operated at the time of the crash. N Prcnt Code Label 50 2.2 1 First time driving this vehicle 62 2.7 2 Had driven this vehicle 2-5 times in the past six months 40 1.8 3 Had driven this vehicle 6-10 times in the past six months 1,387 60.7 4 Had driven this vehicle more than 10 times in the past six months 24 1.1 7 No driver present 721 31.6 9 Unknown Variable Name Format Type Length ML747F Numeric 8 KnewRoad Definition: Establishes the driver’s familiarity with the approach to the crash site. N Prcnt Code Label 111 4.9 1 First time driving on this roadway 196 8.6 2 Rarely drives on this roadway 151 6.6 3 Drives on this roadway once per month 105 4.6 4 Drives on this roadway several times per month 421 18.4 5 Drives on this roadway weekly 632 27.7 6 Drives on this roadway daily 24 1.1 7 No driver present LTCCS Codebook DriverAssessment Data Set • 74 Codebook - DriverAssessment Data Set N Prcnt Code Label 57 2.5 8 Other frequency (specify) 587 25.7 9 Unknown Variable Name Format Type Length WorkPressureCount AP3U Numeric 8 Definition: A count of the number of work pressure variables. This includes attributes from the original variable “Driver Under Work-Related Pressure,” which were broken out into individual variables. N Prcnt Code Label 1,512 66.2 0 0 104 4.6 1 1 14 0.6 2 2 24 1.1 7 7 630 27.6 99 Unknown Variable Name Format Type Length AP1U Numeric 8 NewPosition Definition: Establishes whether or not the driver was under pressure from his/her employer as a result of learning a new position in his/her primary work place. (This variable was originally an attribute choice under the variable “Driver Under Work-Related Pressure.”) N Prcnt Code Label 2,266 99.2 0 Absent 18 0.8 1 Present Format Type Length Variable Name AP1U Numeric 8 ShippingDeadline Definition: Establishes whether or not the driver experienced work pressure as a result of being under time-related pressures associated with production/shipping deadlines. (This variable was originally an attribute under the variable “Driver Under Work-Related Pressure.”) N Prcnt Code Label 2,280 99.8 0 Absent 4 0.2 1 Present LTCCS Codebook DriverAssessment Data Set • 75 Codebook - DriverAssessment Data Set Format Type Length Variable Name AP1U Numeric 8 EXPWorkSchedule Definition: Establishes whether or not the driver was experiencing any pressure on the job as it relates to his/her work schedule. (This variable was originally an attribute choice under the variable “Driver Under Work-Related Pressure.”) N Prcnt Code Label 2,257 98.8 0 Absent 27 1.2 1 Present Variable Name Format Type Length AP1U Numeric 8 Quotas Definition: Establishes whether or not the driver experienced any work pressure with regard to additional production or sales requirements. (This variable was originally an attribute choice under the variable “Driver Under Work-Related Pressure.”) N Prcnt Code Label 2,283 100.0 0 Absent 1 0.0 1 Present Format Type Length Variable Name AP1U Numeric 8 ExtraLoads Definition: Establishes whether or not the driver was under pressure from his/her employer to accept loads with little or no advance notice. (This variable was originally an attribute choice under the variable “Driver Under Work-Related Pressure.) N Prcnt Code Label 2,275 99.6 0 Absent 9 0.4 1 Present Variable Name Format Type Length AP1U Numeric 8 Demoted Definition: Establishes whether or not the driver had recently been forced to accept a demotion and/or pay decrease. (This variable was originally an attribute choice under the variable “Driver Under Work-Related Pressure.”) N Prcnt Code Label 2,283 100.0 0 Absent 1 0.0 1 Present LTCCS Codebook DriverAssessment Data Set • 76 Codebook - DriverAssessment Data Set Format Type LengthVariable Name AP1U Numeric 8 SelfInducedIllegal Definition: Establishes whether or not the driver experienced self-induced work pressure, as opposed to employer-induced pressure. The driver was pressuring himself to do things that are considered illegal (e.g. a truck driver continuing to drive even though he knows he is over his allowed driving hours). (This variable was originally an attribute choice under the variable “Work-Related Pressure” in the electronic data system, but was not found on the paper version of the Crash Event Assessment Form.) N Prcnt Code Label 2,272 99.5 0 Absent 12 0.5 1 Present Format Type Length Variable Name AP1U Numeric 8 SelfInducedOther Definition: Establishes whether or not the driver experienced self-induced work pressure, as opposed to employer-induced pressure. (This variable was originally an attribute choice under the variable “Work-Related Pressure” in the electronic data system, but was not found on the paper version of the Crash Event Assessment Form.) N Prcnt Code Label 2,246 98.3 0 Absent 38 1.7 1 Present Format Type Length Variable Name AP1U Numeric 8 OtherPressure Definition: Establishes whether or not the driver experienced any work-related pressure that was not captured under other work-pressure variables. (This variable was originally an attribute choice under the variable “Driver Under Work-Related Pressure” and was the “Other (specify)” attribute choice). N Prcnt Code Label 2,262 99.0 0 Absent 22 1.0 1 Present Variable Name Format Type Length AP2U Numeric 8 ComfortCount Definition: Establishes the total number of attributes coded for the variable “Other Factor Types,” which had to do with a driver’s comfort with traffic conditions and the vehicle. N Prcnt Code Label 1,558 68.2 0 0 69 3.0 1 1 3 0.1 2 2 LTCCS Codebook DriverAssessment Data Set • 77 Codebook - DriverAssessment Data Set N Prcnt Code Label 24 1.1 7 No Driver Present 630 27.6 9 Unknown Variable Name Format Type Length TrafficDensity AP1U Numeric 8 Definition: Establishes whether or not the driver was uncomfortable with the surrounding traffic densities. The densities are usually very high as might be associated with rush hour traffic. (This variable was originally an attribute choice under the variable “Other Factor Types,” which had to do with driver experience.) N Prcnt Code Label 2,279 99.8 0 Absent 5 0.2 1 Present Format Type LengthVariable Name AP1U Numeric 8 TrafficSpeed Definition: Establishes whether or not the driver was uncomfortable with the general speed of surrounding traffic. The discomfort is typically associated with the driver feeling that surrounding traffic is moving too fast. (This variable was originally an attribute choice under the variable “Other Factor Types,” which had to do with driver experience.) N Prcnt Code Label 2,283 100.0 0 Absent 1 0.0 1 Present Format Type LengthVariable Name AP1U Numeric 8 ADRTrafficFlow Definition: Establishes whether or not the driver was uncomfortable with the general flow of surrounding traffic. (This variable was originally an attribute choice under the variable “Other Factor Types,” which had to do with driver experience.) N Prcnt Code Label 2,283 100.0 0 Absent 1 0.0 1 Present LTCCS Codebook DriverAssessment Data Set • 78 Codebook - DriverAssessment Data Set Format Type Length Variable Name AP1U Numeric 8 VehicleLoad Definition: Establishes whether or not the driver was uncomfortable with either the vehicle or the load. (This variable was originally an attribute choice under the variable “Other Factor Types,” which had to do with driver experience.) N Prcnt Code Label 2,247 98.4 0 Absent 37 1.6 1 Present Variable Name Format Type Length AP1U Numeric 8 OtherComfortFactor Definition: Establishes whether or not the driver had an “other” experience/exposure factor that was relevant to the crash that was not described by the other comfort variables. (This variable was originally an attribute choice under the variable “Other Factor Types,” was was the “Other (specify)” attribute choice.) N Prcnt Code Label 2,253 98.6 0 Absent 31 1.4 1 Present Variable Name Format Type Length ML736F Numeric 8 LoadPressure Definition: Documents the circumstance where the driver is under some pressure from the carrier to accept additional loads. N Prcnt Code Label 1,007 44.1 0 Not under pressure to accept loads 1 0.0 1 Accept unscheduled loads on scheduled trip 2 0.1 2 Accept additional loads on unscheduled trip 2 0.1 3 Accept unscheduled loads on short notice scheduled trip 12 0.5 4 Accept additional loads when over allowable driving hours 1,018 44.6 7 Not applicable 23 1.0 8 Other load factors (specify) 219 9.6 9 Unknown LTCCS Codebook DriverAssessment Data Set • 79 Codebook - DriverAssessment Data Set Format Type Length Variable Name AP4U Numeric 8 WorkFatigueCount Definition: A count of the number of work fatigue-related variables. This includes attributes from the original variable “Under Pressure to Operate Even if Fatigued,” which were broken out into individual variables. N Prcnt Code Label 1,016 44.5 0 0 35 1.5 1 1 2 0.1 2 2 1,007 44.1 7 Not applicable 224 9.8 9 Unknown Variable Name Format Type Length AP1U Numeric 8 ScheduledExtensions Definition: Establishes whether or not the driver experienced work pressure due to his/her carrier scheduling trips in a manner that requires extended work shifts to complete. (This variable was originally an attribute under the variable “Under Pressure to Operate Even if Fatigued.”) N Prcnt Code Label 2,272 99.5 0 Absent 12 0.5 1 Present Format Type LengthVariable Name AP1U Numeric 8 RotatingShift Definition: Est