FMCSR 172.304: Hazmat Marking Durability — Driver Q&A

No. Across our 13 million inspection records, FMCSR 172.304 has never resulted in an out-of-service placement. The regulation is non-OOS eligible, meaning inspectors can cite it but cannot remove your vehicle from service on this violation alone.

For context, related hazmat marking violations show vastly different outcomes: placard deterioration (172.516) results in OOS only 1.6% of the time, while general placarding violations (177.817a) result in OOS 75.1% of the time. A 172.304 citation is among the lowest-consequence hazmat marking violations.

This violation carries a severity weight of 3, which is on the lower end of the CSA scale. Within a 30-day window, your weight increases based on frequency—a single citation at weight 3 becomes 3 CSA points. Multiple citations in 30 days stack the multiplier.

For comparison: this is less severe than many hazmat violations. Related codes like general loading/unloading violations (177.834A) also carry weight 3, but those result in OOS 99.2% of the time, whereas 172.304 never does.

Take these steps now:

1. Document the cargo — photograph the hazmat markings as they currently appear on your vehicle and any shipping papers.
2. Inspect all markings — check that labels/placards are actually durable, legible, and affixed correctly per 172.304 requirements.
3. Correct any issues — replace or re-affix any marking that is faded, peeling, or not in English.
4. Request reinspection — contact your state DOT to verify compliance after correction.
5. Keep records — maintain photos and correspondence showing remediation.

Since this is not an OOS violation, you have time to fix it without emergency repairs, but do not ignore it.

No, 172.304 is one of the least-cited and lowest-severity hazmat marking violations. Our inspection database shows zero all-time citations for 172.304, compared to thousands for related violations.

Peer violations in the same category:

• General loading/unloading (177.834A): 3,954 citations, 99.2% OOS rate
• Placarding violations (177.817a): 2,274 citations, 75.1% OOS rate
• Placard damaged/obscured (172.516c): 1,796 citations, 1.6% OOS rate

The stark zero-citation count suggests 172.304 is either rarely enforced or represents a narrow violation type. It remains a valid compliance requirement, but the enforcement data shows it's not a common citation.

Yes. FMCSA allows you to contest roadside inspection findings through the DataQs system. For a 172.304 citation, your challenge will likely center on whether the markings were actually non-durable or simply appeared worn in the inspector's judgment.

Document your appeal with:

• Photographs of the markings pre- and post-citation
• Evidence the markings met 172.304 requirements (durable material, English language, properly affixed)
• Testimony about cargo handling conditions

DataQs decisions typically take 30–60 days. Success depends on whether the inspector correctly identified a durability defect versus normal wear.

According to our 13 million-record database, 172.304 has zero citations in the last 12 months and zero in the last 90 days. This suggests either very low enforcement activity or that the violation is rarely observed in roadside inspections.

This is dramatically different from related placarding violations—172.516 (placard damaged/deteriorated) logged 1,796 citations all-time and remains a regular enforcement point. If you are cited for 172.304, treat it as noteworthy because it is uncommon, and ensure your markings genuinely meet the durability standard.

FMCSR 172.304 violations appear in your carrier's safety record as a Basic violations under the Hazardous Materials category. Both you as the driver and your company will see the citation in the FMCSA Safety Management System (SMS) database.

Your role as driver does not shield the carrier from the violation—this is a vehicle/cargo compliance issue, so the citation impacts the company's BASIC CSA score. Work with your fleet to document the correction and request that the company monitor future hazmat pre-trip inspections to prevent recurrence.

Our inspection records show zero citations for FMCSR 172.304 across all 50 states and U.S. territories in our entire database. This means we cannot identify a state-by-state enforcement pattern.

For hazmat marking compliance, the safest approach is to assume equal risk everywhere. Inspectors in any state can cite 172.304 if they observe non-durable, non-English, or improperly affixed hazmat markings. Focus on compliance nationwide, not regional enforcement trends.