172.324 — Non-bulk hazardous substance not marked
FMCSA violation code under Hazardous Materials. 11 events recorded in roadside inspections. Severity weight: N/A.
Violation Description
Non-bulk hazardous substance not marked
About This Violation Code
Code 172.324 falls under the Hazardous Materials BASIC category in FMCSA's Safety Measurement System (SMS).
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 172.324 in the Federal Motor Carrier Safety Regulations.
Top Enforcing States
Where 172.324 is most commonly cited (last 180 days)
Click a state to see roadside inspection activity, top stations, and carrier profiles in that jurisdiction.
Citation Trend (12 months)
Monthly count of 172.324 citations. Red bars mark months with OOS-triggering citations.
Most Active Stations
Inspection stations citing 172.324 most often (last 180 days)
Often Cited Together
Other violations commonly found on the same inspection (last 90 days)
Citation patterns suggest related root causes (e.g., HOS violations paired with logbook errors).
Top Carriers Cited
Ranked by frequency • 11 carriers total
Top Carriers with 172.324 Violations
| # | Carrier | USDOT | # Violations |
|---|---|---|---|
| #1 | ROTO-ROOTER SERVICES COMPANY | 652297 | 1 |
| #2 | XPO LOGISTICS FREIGHT INC | 241829 | 1 |
| #3 | HL MOTOR GROUP INC | 2274502 | 1 |
| #4 | REDLINE COURIER EXPRESS INC | 809056 | 1 |
| #5 | PRECISION NDT LLC | 4116914 | 1 |
| #6 | JR SITE CONSTRUCTION CORP | 3404656 | 1 |
| #7 | IOWA CIVIL CONTRACTING INC | 226325 | 1 |
| #8 | SAIA MOTOR FREIGHT LINE LLC | 29124 | 1 |
| #9 | HOOSIERLAND EXCAVATING LLC | 802890 | 1 |
| #10 | BAROCK INC | 2388647 | 1 |
| #11 | XPRESS INTERNACIONAL S DE RL DE CV | 1598663 | 1 |
Recent Inspections
Latest inspections where 172.324 was cited • 11 total events
Recent Inspections with 172.324
| Date | Report # | State | Level | OOS |
|---|---|---|---|---|
| Mar 2, 2026 | 87190811 | IL | Level 1 | No |
| Feb 25, 2026 | 87204709 | TX | Level 1 | No |
| Feb 24, 2026 | 87165247 | TX | Level 2 | No |
| Nov 6, 2025 | 86285599 | TX | Level 1 | No |
| Jul 5, 2025 | 85143476 | TX | Level 2 | No |
| May 15, 2024 | 81670880 | NY | Level 2 | No |
| Mar 13, 2024 | 81106274 | KS | Level 1 | No |
| Feb 4, 2024 | 80798831 | MA | Level 1 | No |
| Nov 27, 2023 | 81045556 | PR | Level 4 | No |
| Oct 19, 2023 | 79973898 | NY | Level 1 | No |
| May 23, 2023 | 78762985 | TX | Level 1 | No |