Safety Measurement System - Complete SMS Profile (U.S. DOT# 451422)

R L MCNAIR & SON LLC

U.S. DOT#: 451422

Address: 17618 OLD GETTYSBURG RD
EMMITSBURG, MD 21727-9101
Number of Vehicles: 21
Number of Drivers: 9
Number of Inspections: 32

Safety Rating & OOS Rates AND Licensing and Insurance

As part of FMCSA’s IT modernization strategy, we are in the process of merging our data platforms to make it easier for you to find the information you need. During this transition, please refer to the links below for additional information about this carrier.

For licensing and insurance information, visit Motus: USDOT Registration System.
For safety rating and Out-of-Service (OOS) rates, visit SAFER.
If you are a motor carrier looking for your Inspection Selection System (ISS) value, log in to the FMCSA Portal.

BASIC Status (Public Property Carrier View)

Behavior Analysis & Safety Improvement Categories (BASICs) Based on a 24-month record ending August 28, 2026

On-Road Performance
2.20 Measure	Not Public	0 Measure	5.42 Measure	0.51 Measure	Not Public	0.13 Measure
On-Road Performance Detail
Driver Inspections with Unsafe Driving Violations: 6 Safety Event Group: 5-8 driver inspections with Unsafe Driving Violations Avg. PU × UF: 37.2 Segment: Straight Carrier	Not Public	Driver Inspections: 32 with HOS Compliance Violations: 0 Safety Event Group: 21-100 relevant driver inspections	Vehicle Inspections: 28 with Vehicle Maint. Violations: 15 Safety Event Group: 21-100 relevant vehicle inspections	Driver Inspections: 32 with Drugs/Alcohol Violations: 1 Safety Event Group: 1 driver inspections with Controlled Substances/Alcohol Violations	Not Public	Driver Inspections: 32 with Driver Fitness Violations: 1 Safety Event Group: 21-100 relevant driver inspections
Investigation Results
No Acute/Critical Violations Discovered	N/A	No Acute/Critical Violations Discovered	No Acute/Critical Violations Discovered	No Acute/Critical Violations Discovered	Not Public	No Acute/Critical Violations Discovered

Select a BASIC icon above to get details, or view your Complete SMS Profile.

Violation Summary

Violations: 41


Violations	Description	# Violations	# OOS Violations	Violation Severity Weight	BASIC

392.16-D	Driver - Failed to use seat belt while operating a CMV	1	0	7	Unsafe Driving
392.2-SLLFC	State/Local Laws - Following too closely	1	0	5	Unsafe Driving
392.2-SLLS3	State/Local Laws - Speeding 11-14 miles per hour over the speed limit	1	0	7	Unsafe Driving
392.2-SLLS4	State/Local Laws - Speeding 15 or more miles per hour over the speed limit	3	0	10	Unsafe Driving
392.2-SLLUP	State/Local Laws - Unlawfully parking /leaving vehicle on roadway	1	0	1	Unsafe Driving
383.23A2-LCDLNP	License (CDL) - Operate a CMV while not in possession of a CDL on person	1	0	8	Driver Fitness
392.4A-DOSP	Drugs/Other Substances - Operate a CMV while in possession.	1	1	10	Drugs/Alcohol
393.134B-CRHLC	Roll-on/Roll-off/Hook Lift Containers - Improper securement of a roll-on/roll-off and hook lift container	2	2	7	Vehicle Maint.
393.207C-SSLMS	Suspension - A spring leaf is missing or separated	1	1	7	Vehicle Maint.
393.209D-STBSP	Steering - Ball and socket joint has movement greater than 1/8 inch measured with hand pressure	1	1	6	Vehicle Maint.
393.45B2-B-AIR	Air Brake - Hose/tubing damaged or not secured	1	0	4	Vehicle Maint.
393.45B2-BHTD	Air Brake - Hose/tubing damage into the outer reinforcement ply.	1	1	4	Vehicle Maint.
393.45D-B	Air Brake - Audible air leak at a proper connection	1	0	4	Vehicle Maint.
393.47(e)	Brake Out of Adjustment - Roto, Clamp (Short & Long), DD-3, or Bolt	6	0	4	Vehicle Maint.
393.53B-B	Air Brake - CMV manufactured on or after 10/20/1994 has an automatic airbrake adjustment system that fails to compensate for wear	5	0	4	Vehicle Maint.
393.60(c)	Windshield - Damaged or Discolored	1	0	1	Vehicle Maint.
393.75C-TAOTD-LT1/32	Tires - Less than 1/32 inch tread depth at 3 locations/2 adjacent tread grooves	1	1	8	Vehicle Maint.
393.75C-TAOTD-LT2/32	Tires - Less than 2/32 inch tread depth	1	0	8	Vehicle Maint.
393.95A1	Emergency Equipment - Fire Extinguishers - no fire extinguisher present or not properly rated.	1	0	2	Vehicle Maint.
393.9A-LBL	Lighting - Backup lamp inoperative	1	0	6	Vehicle Maint.
393.9A-LCL	Lighting - Clearance lamp(s) inoperative	2	0	2	Vehicle Maint.
393.9A-LIL	Lighting - Identification lamp(s) inoperative	1	0	2	Vehicle Maint.
396.17C-PI	Operating a CMV without documentation of a periodic inspection	1	0	4	Vehicle Maint.
396.3A1-BALAC	Brake - Audible air leak from a brake chamber	1	0	4	Vehicle Maint.
396.3(a)1BOS	Brake - Defective brake(s) are equal to or greater than 20% of the service brakes on the vehicle/combination	2	2	0	Vehicle Maint.
396.5B-L	Lubrication - Oil or grease leak	1	0	3	Vehicle Maint.
396.9D2-FTF	Failing to correct the violation(s)/defect(s) noted on the roadside inspection report	1	0	4	Vehicle Maint.

Inspection History

Total Inspections: 32


Report			Vehicle			Measure
Inspection Date	Number	State	Plate Number	Plate State	Type	Severity Weight (SW)	Time Weight (TiW)

8/27/2026	PAE919623972	PA	254ED59	MD	STRAIGHT TRUCK		3
Vehicle Maint. Violation: 393.9A-LBL Lighting - Backup lamp inoperative						6
8/10/2026	PAH206622269	PA	268ED47	MD	STRAIGHT TRUCK		3
Vehicle Maint. Violation: 396.9D2-FTF Failing to correct the violation(s)/defect(s) noted on the roadside inspection report						4
7/6/2026	MD0226C00923	MD	381ED48	MD	STRAIGHT TRUCK		3
Vehicle Maint. Violation: 393.134B-CRHLC Roll-on/Roll-off/Hook Lift Containers - Improper securement of a roll-on/roll-off and hook lift container (OOS)						7 + 2 (OOS)
6/30/2026	PAXL00115007	PA	381ED48	MD	STRAIGHT TRUCK		3
5/18/2026	PAH206613860	PA	268ED47	MD	STRAIGHT TRUCK		3
5/13/2026	MD0226C00826	MD	375ED11	MD	STRAIGHT TRUCK		3
Drugs/Alcohol Violation: 392.4A-DOSP Drugs/Other Substances - Operate a CMV while in possession. (OOS)						10 + 0 (OOS)
4/20/2026	PAJ608611004	PA	322ED68	MD	STRAIGHT TRUCK		3
Vehicle Maint. Violation: 393.45B2-B-AIR Air Brake - Hose/tubing damaged or not secured						4
3/9/2026	MD0327C00808	MD	345ED12	MD	STRAIGHT TRUCK		3
Vehicle Maint. Violation: 393.47(e) Brake Out of Adjustment - Roto, Clamp (Short & Long), DD-3, or Bolt						4
Vehicle Maint. Violation: 393.53B-B Air Brake - CMV manufactured on or after 10/20/1994 has an automatic airbrake adjustment system that fails to compensate for wear						4
2/25/2026	MD0290C00616	MD	381ED48	MD	STRAIGHT TRUCK		2
Vehicle Maint. Violation: 393.95A1 Emergency Equipment - Fire Extinguishers - no fire extinguisher present or not properly rated.						2
2/11/2026	MD0327C00754	MD	286ED39	MD	STRAIGHT TRUCK		2
Vehicle Maint. Violation: 393.53B-B Air Brake - CMV manufactured on or after 10/20/1994 has an automatic airbrake adjustment system that fails to compensate for wear						4
Vehicle Maint. Violation: 393.47(e) Brake Out of Adjustment - Roto, Clamp (Short & Long), DD-3, or Bolt						4
Vehicle Maint. Violation: 396.5B-L Lubrication - Oil or grease leak						3
Vehicle Maint. Violation: 393.45D-B Air Brake - Audible air leak at a proper connection						4
Vehicle Maint. Violation: 393.209D-STBSP Steering - Ball and socket joint has movement greater than 1/8 inch measured with hand pressure (OOS)						6 + 2 (OOS)
1/15/2026	MD0329C00046	MD	375ED11	MD	STRAIGHT TRUCK		2
Vehicle Maint. Violation: 393.45B2-BHTD Air Brake - Hose/tubing damage into the outer reinforcement ply. (OOS)						4 + 2 (OOS)
1/2/2026	MD0327C00632	MD	320ED46	MD	STRAIGHT TRUCK		2
Vehicle Maint. Violation: 393.9A-LCL Lighting - Clearance lamp(s) inoperative						2
Vehicle Maint. Violation: 393.47(e) Brake Out of Adjustment - Roto, Clamp (Short & Long), DD-3, or Bolt						4
Vehicle Maint. Violation: 396.3(a)1BOS Brake - Defective brake(s) are equal to or greater than 20% of the service brakes on the vehicle/combination (OOS)						0 + 2 (OOS)
Vehicle Maint. Violation: 393.53B-B Air Brake - CMV manufactured on or after 10/20/1994 has an automatic airbrake adjustment system that fails to compensate for wear						4
12/19/2025	PAE946535383	PA	375ED11	MD	STRAIGHT TRUCK		2
Unsafe Driving Violation: 392.2-SLLS4 State/Local Laws - Speeding 15 or more miles per hour over the speed limit						10
Unsafe Driving Violation: 392.2-SLLFC State/Local Laws - Following too closely						5
11/18/2025	MD2404C00969	MD	286ED39	MD	STRAIGHT TRUCK		2
Vehicle Maint. Violation: 393.60(c) Windshield - Damaged or Discolored						1
Vehicle Maint. Violation: 393.9A-LIL Lighting - Identification lamp(s) inoperative						2
11/13/2025	MD1969C00438	MD	375ED11	MD	STRAIGHT TRUCK		2
Unsafe Driving Violation: 392.16-D Driver - Failed to use seat belt while operating a CMV						7
11/3/2025	MD0280C00661	MD	357ED19	MD	STRAIGHT TRUCK		2
Unsafe Driving Violation: 392.2-SLLS4 State/Local Laws - Speeding 15 or more miles per hour over the speed limit						10
9/23/2025	PAE906526662	PA	375ED11	MD	STRAIGHT TRUCK		2
9/9/2025	MD1969C00292	MD	316ED34	MD	STRAIGHT TRUCK		2
Vehicle Maint. Violation: 393.47(e) Brake Out of Adjustment - Roto, Clamp (Short & Long), DD-3, or Bolt						4
Vehicle Maint. Violation: 393.75C-TAOTD-LT1/32 Tires - Less than 1/32 inch tread depth at 3 locations/2 adjacent tread grooves (OOS)						8 + 2 (OOS)
Vehicle Maint. Violation: 393.53B-B Air Brake - CMV manufactured on or after 10/20/1994 has an automatic airbrake adjustment system that fails to compensate for wear						4
8/27/2025	MD0327C00318	MD	320ED46	MD	STRAIGHT TRUCK		1
Vehicle Maint. Violation: 396.3A1-BALAC Brake - Audible air leak from a brake chamber						4
Vehicle Maint. Violation: 393.53B-B Air Brake - CMV manufactured on or after 10/20/1994 has an automatic airbrake adjustment system that fails to compensate for wear						4
Vehicle Maint. Violation: 393.47(e) Brake Out of Adjustment - Roto, Clamp (Short & Long), DD-3, or Bolt						4
Driver Fitness Violation: 383.23A2-LCDLNP License (CDL) - Operate a CMV while not in possession of a CDL on person						8
Vehicle Maint. Violation: 396.3(a)1BOS Brake - Defective brake(s) are equal to or greater than 20% of the service brakes on the vehicle/combination (OOS)						0 + 2 (OOS)
8/4/2025	MD0217C00152	MD	286ED39	MD	STRAIGHT TRUCK		1
6/25/2025	MD3110C00013	MD	254ED59	MD	STRAIGHT TRUCK		1
5/23/2025	MD3233C00039	MD	322ED68	MD	STRAIGHT TRUCK		1
5/20/2025	MD0296C00107	MD	286ED39	MD	STRAIGHT TRUCK		1
5/15/2025	PAE906513575	PA	254ED59	MD	STRAIGHT TRUCK		1
Unsafe Driving Violation: 392.2-SLLUP State/Local Laws - Unlawfully parking /leaving vehicle on roadway						1
5/12/2025	PAJ622513204	PA	322ED68	MD	STRAIGHT TRUCK		1
Vehicle Maint. Violation: 393.134B-CRHLC Roll-on/Roll-off/Hook Lift Containers - Improper securement of a roll-on/roll-off and hook lift container (OOS)						7 + 2 (OOS)
Vehicle Maint. Violation: 393.75C-TAOTD-LT2/32 Tires - Less than 2/32 inch tread depth						8
Vehicle Maint. Violation: 396.17C-PI Operating a CMV without documentation of a periodic inspection						4
2/1/2025	MD0280007568	MD	325ED86	MD	STRAIGHT TRUCK		1
1/24/2025	PAC129000213	PA	345ED12	MD	STRAIGHT TRUCK		1
11/27/2024	MD1997005531	MD	286ED39	MD	STRAIGHT TRUCK		1
Vehicle Maint. Violation: 393.9A-LCL Lighting - Clearance lamp(s) inoperative						2
11/25/2024	MD0194001140	MD	268ED47	MD	STRAIGHT TRUCK		1
Unsafe Driving Violation: 392.2-SLLS3 State/Local Laws - Speeding 11-14 miles per hour over the speed limit						7
11/12/2024	MD9815001077	MD	286ED39	MD	STRAIGHT TRUCK		1
Unsafe Driving Violation: 392.2-SLLS4 State/Local Laws - Speeding 15 or more miles per hour over the speed limit						10
10/21/2024	MD1969006710	MD	316ED34	MD	STRAIGHT TRUCK		1
Vehicle Maint. Violation: 393.207C-SSLMS Suspension - A spring leaf is missing or separated (OOS)						7 + 2 (OOS)
Vehicle Maint. Violation: 393.47(e) Brake Out of Adjustment - Roto, Clamp (Short & Long), DD-3, or Bolt						4
10/9/2024	MD0278005610	MD	268ED47	MD	STRAIGHT TRUCK		1

Reviewed-Not Preventable Crash Activity (vehicles involved in crashes)

Total Number of Crashes: 0

This carrier has no crashes to display.

Crashes Included in SMS (vehicles involved in crashes)

Total Number of Crashes: 1


Report			Vehicle		Crash				Measure = Sum of the Total Weight (TotW)
Date	Number	State	Plate Number	Plate State	Fatal	Inj.	Tow.	HM	Severity Weight (SW)	Time Weight (TiW)	Total Weight (TotW)

8/26/2025	PA507930400X	PA	320ED46	MD	0	0	Yes	No	1	1	1

Investigation Results

Acute/Critical Violations: 0

This carrier has no Acute/Critical violations to display.

Summary of Activities

The summary includes information on the 5 most recent investigations and 24 months of inspections and crash history.

Most Recent Investigation:
Total Inspections: 32
- Total Inspections without Violations used in SMS: 10
- Total Inspections with Violations used in SMS: 22
Total Crashes* : 1

*Crashes listed represent a motor carrier’s involvement in reportable crashes, regardless of the carrier’s or driver’s role in the crash. Continue for details.

Continue for more Crash, Inspection & Investigation Details

Carrier Registration

Carrier Registration Details Subject to General Threshold Update Registration Info

Inspection Selection System

For licensing and insurance information, visit Motus: USDOT Registration System.
For safety rating and Out-of-Service (OOS) rates, visit SAFER.
If you are a motor carrier looking for your Inspection Selection System (ISS) value, log in to the FMCSA Portal.

Enforcement Cases

(Six years as of 09/13/2026 updated monthly from FMCSA )

No penalties found

Tools/Resources

SMS Methodology How to Improve Request a Data Review

For U.S. DOT# 451422

Complete SMS Profile Carrier History Downloads

Summary of Activities (as of 8/28/2026, updated monthly)

The summary includes information on the 5 most recent investigations and 24 months of inspections and crash history.

Most Recent Investigation: None	Total Inspections: 32 Total inspections without violations used in SMS: 10 Total inspections with violations used in SMS: 22	Total Crashes: 1*
	# Insp. OOS Driver Inspections 32 3.1% Vehicle Inspections 28 28.6% Placardable HM Inspections 0 0.0% % Placardable HM Inspections 0.0%	Fatal Crashes 0 Injury Crashes 0 Towaway Crashes 1

*Crashes listed represent a motor carrier’s involvement in reportable crashes, regardless of the carrier’s or driver’s role in the crash. Continue for details.

Downloads

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Average PU × Utilization Factor (as of 8/28/2026, updated monthly)

The SMS normalizes the Unsafe Driving and Crash Indicator BASICs measure by carrier size (i.e., a hybrid power unit and vehicle miles travelled measure) to account for exposure. Carrier size is defined as average power units multiplied by the utilization factor.

37.2 Average PU × Utilization Factor = 20.3 Average Power Units × 1.8275 Utilization Factor

Average Power Units
Utilization Factor

In order to account for changes in a carrier's fleet size during the previous 24 months an average power unit value is used in the calculation to determine a carrier's Unsafe Driving BASIC and Crash Indicator measures.

20.3 Average Power Units = 21 Current Power Units + 21 Power Units 6 Months Ago + 19 Power Units 18 Months Ago
3

The Utilization Factor is a multiplier that adjusted the average PU values based on the utilization in terms of VMT per average PU.

Determine Carrier Segment: Straight
Straight trucks/other vehicles constituting more than 30% of the total PU
U.S. DOT# 451422 = 90% Straight trucks/other vehicles
Determine VMT per Average Power Unit
36,550 VMT per Average Power Unit = 743,079 VMT From Registration (MCS-150) ÷ 20.3 Average Power Units

Based on Step 1 and 2 calculate the Utilization Factor

Straight Segment
Meets Criteria	VMT per Avgerage PU	Utilization Factor
	< 20,000	1
	20,000 – 60,000	1.8275 = 36,550 VMT per PU ÷ 20,000
	60,000 – 200,000	3
	> 200,000	1
	No Recent VMT Information	1

Use of SMS Data/Information

FAST Act of 2015:

Readers should not draw conclusions about a carrier's overall safety condition simply based on the data displayed in this system. Unless a motor carrier has received an UNSATISFACTORY safety rating under part 385 of title 49, Code of Federal Regulations, or has otherwise been ordered to discontinue operations by the Federal Motor Carrier Safety Administration, it is authorized to operate on the Nation's roadways.

Safety Measurement System:

The data in the Safety Measurement System (SMS) is performance data used by the Agency and Enforcement Community. A symbol, based on that data, indicates that FMCSA may prioritize a motor carrier for further monitoring.

The symbol is not intended to imply any federal safety rating of the carrier pursuant to 49 USC 31144. Readers should not draw conclusions about a carrier's overall safety condition simply based on the data displayed in this system. Unless a motor carrier in the SMS has received an UNSATISFACTORY safety rating pursuant to 49 CFR Part 385, or has otherwise been ordered to discontinue operations by the FMCSA, it is authorized to operate on the nation's roadways.

Motor carrier safety ratings are available at http://safer.fmcsa.dot.gov and motor carrier licensing and insurance status are available at http://li-public.fmcsa.dot.gov/.