397.7B — Hazmat parking violation
FMCSA violation code under Hazardous Materials. 10 events recorded in roadside inspections. Severity weight: 6.
Violation Description
Parking a commercial motor vehicle carrying hazardous materials in an unauthorized location.
About This Violation Code
Code 397.7B falls under the Hazardous Materials BASIC category in FMCSA's Safety Measurement System (SMS). It carries a severity weight of 6 (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 397.7B in the Federal Motor Carrier Safety Regulations.
Citation Trend (12 months)
Monthly count of 397.7B citations. Red bars mark months with OOS-triggering citations.
Top Carriers Cited
Ranked by frequency • 10 carriers total
Top Carriers with 397.7B Violations
| # | Carrier | USDOT | # Violations |
|---|---|---|---|
| #1 | GAS CYLINDER SERVICES | 1267605 | 1 |
| #2 | USA LOGISTICS INC | 1892938 | 1 |
| #3 | SERVICIOS ESPECIALIZADOS ALANIS SA DE CV | 559477 | 1 |
| #4 | SARA GABRIELA ALZAGA PEREZ | 2877022 | 1 |
| #5 | ANSELMO ALEJANDRO PEREZ RUVALCABA | 3752938 | 1 |
| #6 | TRANSFER FRONTERA SA DE CV | 3941734 | 1 |
| #7 | ATF TRANSPORT SA DE CV | 3731538 | 1 |
| #8 | TRANSPORTES ESPECIALIZADOS ANTONIO GARZA RUIZ SA DE CV | 736463 | 1 |
| #9 | COASTAL TRANSPORT CO INC | 36647 | 1 |
| #10 | ALBERTO VAZQUEZ PEREZ | 3260169 | 1 |
Recent Inspections
Latest inspections where 397.7B was cited • 10 total events
Recent Inspections with 397.7B
| Date | Report # | State | Level | OOS |
|---|---|---|---|---|
| Jun 27, 2025 | 85143490 | TX | Level 2 | No |
| Jun 27, 2025 | 85297187 | TX | Level 2 | No |
| Jan 7, 2025 | 83568480 | TX | Level 3 | No |
| Oct 24, 2024 | 83001087 | LA | Level 3 | No |
| Dec 12, 2023 | 80481499 | TX | Level 2 | No |
| Dec 12, 2023 | 80481500 | TX | Level 2 | No |
| Dec 12, 2023 | 80395184 | TX | Level 3 | No |
| Dec 12, 2023 | 80395183 | TX | Level 2 | No |
| Dec 11, 2023 | 80396733 | TX | Level 2 | No |
| Dec 4, 2023 | 80395143 | TX | Level 2 | No |