TruckCodex

172.506A1 — Placard not visible from direction it faces

FMCSA violation code under Hazardous Materials. 105 events recorded in roadside inspections. Severity weight: 4.

Severity Weight
4
OOS Eligible
No
BASIC Category
Hazardous Materials
Total Events
105
Code
172.506A1
Code System
FMCSR
BASIC Category
Hazardous Materials
OOS Eligible
No
Severity Weight
4
Violation Group
—
Total Events
105
Carriers Cited
100

Violation Description

Hazardous materials placard not clearly visible from the direction it faces or not maintained in legible condition.

About This Violation Code

Code 172.506A1 falls under the Hazardous Materials BASIC category in FMCSA's Safety Measurement System (SMS). It carries a severity weight of 4 (scale 1-10, higher = more severe).

When this violation is cited during a roadside inspection, it contributes to the carrier's Hazardous Materials 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 172.506A1 in the Federal Motor Carrier Safety Regulations.

View on eCFR.gov →FMCSA Violations Search →
Events (all time)
105
OOS Events
19
OOS Rate
18.1%
Top State (180d)
Texas
23 events

Top Enforcing States

Where 172.506A1 is most commonly cited (last 180 days)

1.Texas
23
OOS 34.8%
2.North Carolina
1
OOS 0.0%

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

Citation Trend (12 months)

Monthly count of 172.506A1 citations. Red bars mark months with OOS-triggering citations.

3
Apr
5
May
7
Jun
7
Jul
2
Aug
12
Sep
8
Oct
7
Nov
3
Dec
8
Feb
3
Mar

Most Active Stations

Inspection stations citing 172.506A1 most often (last 180 days)

1.COLUMBIA POE
3
OOS 33.3%
2.18155 KICKAPOO RD
1
OOS 100.0%
3.393M IH35E NB
1
OOS 0.0%
4.CAGE ROADWAY SOUTH B
1
OOS 100.0%
5.FM 509 SOUTH OF US 2
1
OOS 0.0%
6.IH-30 MM 193 WB
1
OOS 0.0%
7.IH 35 NB MM 59
1
OOS 0.0%
8.LAT:31 30' 18.72N
1
OOS 0.0%
9.PHARR POE
1
OOS 100.0%
10.SH-0191 IN MIDLAND CO. (269-27
1
OOS 0.0%

Often Cited Together

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

393.48A4 co-occurrences396.3A14 co-occurrences393.93 co-occurrences396.17C2 co-occurrences172.516C62 co-occurrences172.602C12 co-occurrences393.75A32 co-occurrences392.2RG2 co-occurrences177.817A2 co-occurrences393.45B2UV2 co-occurrences

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

Top Carriers Cited

Ranked by frequency • 100 carriers total • Page 1 of 4

Top Carriers with 172.506A1 Violations

Showing 25 of 100

fmcsa-violations
Top Carriers with 172.506A1 Violations
#CarrierUSDOT# Violations
#1TRISA COMERCIAL SA DE C V9104392
#2DAVID ALBERTO DAMKEN GUERRERO40332432
#3RAFAEL ROMERO DE LA GARZA37792122
#4AUTOTRANSPORTES VARELA DAVILA DE REYNOSA SA DE CV19394492
#5SIMPLY AQUATICS INCORPORATED10855202
#6BARAKA TRUCKING INC37355551
#7RICARDO MAGNO LEAL BUSTAMANTE36644651
#8AVERITT EXPRESS INC366841
#9STAR 3 TRANSPORTATION INC12953551
#10TRAMUC TRANSPORT LLC34417111
#11USA LOGISTICS INC18929381
#12TREATMENT DESIGNS INCORPORATED3770831
#13TRANSPORTES Y MAQUINARIA MORO SA DE CV37826271
#14JOSE CARLOS MENDOZA HERNANDEZ10242221
#15MOMIN TRANSPORT INC13135041
#16KINCO CONSTRUCTION SERVICES LLC43094831
#17STAR TRANSPORTATION LLC5647211
#18A TRUCK EXPRESS INC8023491
#19BYROM TRANSPORTATION INC30061881
#20XPO LOGISTICS FREIGHT INC2418291
#21PRAXAIR MEXICO S DE R L DE C V6405681
#22LOGIFLEX LLC20012541
#23DICKO TRUCKING LLC30633491
#24TRANSPORTACION CARRETERA SA DE CV31008331
#25GKG INC14894861

Recent Inspections

Latest inspections where 172.506A1 was cited • 105 total events • Page 1 of 5

Recent Inspections with 172.506A1

Showing 25 of 105

fmcsa-inspections
Recent Inspections with 172.506A1
DateReport #StateLevelOOS
Mar 25, 202687468338TXLevel 2Yes
Mar 18, 202687373400TXLevel 1Yes
Mar 12, 202687315372TXLevel 1No
Feb 27, 202687183936TXLevel 1Yes
Feb 24, 202687182510TXLevel 2No
Feb 22, 202687182370TXLevel 2No
Feb 21, 202687152531TXLevel 2No
Feb 18, 202687154037TXLevel 1No
Feb 17, 202687080530TXLevel 2No
Feb 13, 202687079670TXLevel 2No
Feb 10, 202687019762TXLevel 1No
Dec 29, 202586695212TXLevel 2No
Dec 18, 202586617753TXLevel 1No
Dec 16, 202586617344TXLevel 2No
Nov 29, 202586443967TXLevel 2Yes
Nov 19, 202586387194TXLevel 1No
Nov 14, 202586341206TXLevel 2No
Nov 13, 202586375022TXLevel 1Yes
Nov 10, 202586301757TXLevel 1Yes
Nov 7, 202586299794TXLevel 2No
Nov 7, 202586284536TXLevel 2Yes
Oct 28, 202586178727NCLevel 2No
Oct 20, 202586121666TXLevel 2No
Oct 20, 202586120565TXLevel 2Yes
Oct 16, 202586094875NMLevel 2No

Data sources & freshness

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

Related records

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