TruckCodex

393.9B-LRLIWR — Lighting - Tail lamp - Both lamps on rearmost vehicle inoperative when required to be on

FMCSA violation code under Vehicle Maintenance. 5,600 events recorded in roadside inspections. Severity weight: N/A.

Severity Weight
N/A
OOS Eligible
No
BASIC Category
Vehicle Maintenance
Total Events
5,600
Code
393.9B-LRLIWR
Code System
FMCSR
BASIC Category
Vehicle Maintenance
OOS Eligible
No
Severity Weight
N/A
Violation Group
—
Total Events
5,600
Carriers Cited
4,775

Violation Description

Lighting - Tail lamp - Both lamps on rearmost vehicle inoperative when required to be on

About This Violation Code

Code 393.9B-LRLIWR falls under the Vehicle Maintenance BASIC category in FMCSA's Safety Measurement System (SMS).

When this violation is cited during a roadside inspection, it contributes to the carrier's Vehicle Maintenance BASIC score. Carriers with high BASIC percentiles may be prioritized for FMCSA interventions including warning letters, investigations, or compliance reviews.

Regulatory Reference

Federal Motor Carrier Safety Regulations

This violation references 49 CFR 393.9B in the Federal Motor Carrier Safety Regulations.

View on eCFR.gov →FMCSA Violations Search →
Events (all time)
5,600
OOS Events
5,424
OOS Rate
96.9%
Top State (180d)
California
206 events

Top Enforcing States

Where 393.9B-LRLIWR is most commonly cited (last 180 days)

1.California
206
OOS 91.3%
2.Pennsylvania
183
OOS 96.7%
3.Washington
138
OOS 100.0%
4.Georgia
111
OOS 100.0%
5.Tennessee
106
OOS 100.0%
6.Missouri
105
OOS 100.0%
7.Michigan
104
OOS 96.2%
8.Arizona
82
OOS 100.0%
9.Maryland
80
OOS 100.0%
10.Kansas
71
OOS 98.6%
11.Ohio
69
OOS 100.0%
12.South Carolina
61
OOS 100.0%
13.New York
57
OOS 100.0%
14.Florida
52
OOS 100.0%
15.Massachusetts
49
OOS 98.0%

Click a state to see roadside inspection activity, top stations, and carrier profiles in that jurisdiction.

Citation Trend (12 months)

Monthly count of 393.9B-LRLIWR citations. Red bars mark months with OOS-triggering citations.

88
Apr
169
May
162
Jun
155
Jul
215
Aug
252
Sep
361
Oct
300
Nov
451
Dec
360
Jan
359
Feb
359
Mar
10
Apr

Most Active Stations

Inspection stations citing 393.9B-LRLIWR most often (last 180 days)

1.PA
62
OOS 98.4%
2.LACEY WA
35
OOS 100.0%
3.KNOXVILLE TN
32
OOS 100.0%
4.NIMITZ IF
27
OOS 88.9%
5.MEMPHIS TN
26
OOS 100.0%
6.MONROE SCALE N/B
17
OOS 100.0%
7.ATLANTA GA
17
OOS 100.0%
8.CORDELIA IF
15
OOS 93.3%
9.RAINBOW IF
15
OOS 100.0%
10.KS
13
OOS 100.0%

Often Cited Together

Other violations commonly found on the same inspection (last 90 days)

393.9A-LIL307 co-occurrences393.9A-LCL211 co-occurrences393.9A-LSML197 co-occurrences393.9A-LLPL189 co-occurrences393.9A-LTSI182 co-occurrences396.17C-PI142 co-occurrences393.9A-LSLIWR98 co-occurrences392.2-SLLSR93 co-occurrences393.75A3-TAOL88 co-occurrences391.41APC64 co-occurrences

Citation patterns suggest related root causes (e.g., HOS violations paired with logbook errors).

Top Carriers Cited

Ranked by frequency • 4,775 carriers total • Page 1 of 191

Top Carriers with 393.9B-LRLIWR Violations

Showing 25 of 4,775

fmcsa-violations
Top Carriers with 393.9B-LRLIWR Violations
#CarrierUSDOT# Violations
#1FEDERAL EXPRESS CORPORATION8687631
#2SWIFT TRANSPORTATION CO OF ARIZONA LLC5428329
#3J B HUNT TRANSPORT INC8080626
#4WESTERN EXPRESS INC51141224
#5NEW PRIME INC370621
#6ESTES EXPRESS LINES12101820
#7CENTRAL TRANSPORT LLC66117318
#8WERNER ENTERPRISES INC5346717
#9UNITED PARCEL SERVICE INC2180017
#10XPO LOGISTICS FREIGHT INC24182916
#11HUB GROUP DEDICATED LLC80182814
#12EVANS DELIVERY COMPANY INC3811112
#13ANNETT HOLDINGS INC8740912
#14US XPRESS INC30302410
#15HOME EXPRESS DELIVERY SERVICE LLC27147019
#16SCHNEIDER NATIONAL CARRIERS INC2641849
#17AAA COOPER TRANSPORTATION922618
#18GREENWOOD MOTOR LINES INC633918
#19NFI INTERACTIVE LOGISTICS LLC14861687
#20IMC LOGISTICS LLC2929917
#21KNIGHT TRANSPORTATION INC4288237
#22CRETE CARRIER CORPORATION737056
#23STEVENS TRANSPORT INC794666
#24ABF FREIGHT SYSTEM INC828665
#25CCBCC OPERATIONS LLC14411625

Recent Inspections

Latest inspections where 393.9B-LRLIWR was cited • 5,600 total events • Page 1 of 224

Recent Inspections with 393.9B-LRLIWR

Showing 25 of 5,600

fmcsa-inspections
Recent Inspections with 393.9B-LRLIWR
DateReport #StateLevelOOS
Apr 2, 202687486945MILevel 2Yes
Apr 2, 202687478025MILevel 2Yes
Apr 2, 202687489183CALevel 2Yes
Apr 1, 202687457341KSLevel 2Yes
Apr 1, 202687477972MILevel 2Yes
Apr 1, 202687474254KSLevel 2Yes
Apr 1, 202687476858MELevel 2Yes
Apr 1, 202687454224CTLevel 2Yes
Apr 1, 202687476737MALevel 2Yes
Apr 1, 202687477817MILevel 2Yes
Mar 31, 202687475102TNLevel 2Yes
Mar 31, 202687474628GALevel 1Yes
Mar 31, 202687474616AZLevel 2Yes
Mar 31, 202687457140SCLevel 2Yes
Mar 31, 202687457468LALevel 2Yes
Mar 31, 202687473811COLevel 2Yes
Mar 31, 202687457681TNLevel 1Yes
Mar 31, 202687450741PALevel 2Yes
Mar 31, 202687469629CALevel 2Yes
Mar 31, 202687457721OHLevel 2Yes
Mar 31, 202687458512SCLevel 2Yes
Mar 31, 202687457932KSLevel 1Yes
Mar 31, 202687451687PALevel 2No
Mar 31, 202687477953MILevel 2Yes
Mar 31, 202687477843MILevel 2Yes

Data sources & freshness

FMCSA Vehicle Inspections and Violations
Unknown freshness
Federal Motor Carrier Safety Regulations (49 CFR)
Unknown freshness

Related records

CategoryAll Vehicle Maintenance Violations
Browse all violation codes in the Vehicle Maintenance BASIC
IndexAll Violation Codes
FMCSR violation codes by BASIC category
ReferenceFMCSA Roadside Inspections
Inspection levels and procedures
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