What 172.325A means in plain language
When you're transporting hazardous materials that are heated above ambient temperature—such as molten metals, hot asphalt, or other thermally elevated cargo—federal regulations require those materials to be clearly marked as "Hot." This marking serves as a critical safety signal to anyone who might come into contact with your vehicle or cargo: inspectors, emergency responders, dock workers, or other drivers.
The purpose is straightforward: prevent burns, injuries, or unsafe handling. If someone doesn't know your cargo is dangerously hot, they might touch it, place it incorrectly, or fail to take appropriate precautions during an accident or emergency. The "Hot" marking is a simple, visible warning that communicates the hazard at a glance.
This rule applies to any elevated-temperature material you're hauling in interstate commerce. The marking itself is part of the hazardous materials shipping papers and placarding system, designed to work alongside other hazmat compliance procedures.
What our enforcement data actually shows
Across 13 million inspections in our database, code 172.325A has generated only 2 all-time citations. In the last 12 months, we recorded 1 citation; in the last 90 days, 0 citations. This makes 172.325A ranked #2651 out of 3,036 FMCSR codes by citation volume—extremely rare in roadside enforcement.
Of the 2 all-time citations on record, neither resulted in an out-of-service order. That gives 172.325A a 0.0% OOS rate. By contrast, the all-FMCSR average OOS rate is 31.4%, meaning this violation is cited so infrequently and treated so leniently that it falls well below enforcement severity thresholds.
The single citation in the last 12 months occurred in July 2025 and did not result in an out-of-service placement. This pattern suggests either very strong compliance by carriers hauling elevated-temperature hazmat, or extremely selective enforcement focus on this particular marking requirement.
Who gets cited most
Our inspection records show only 2 carriers have received citations for 172.325A in our database: J Lowe Express LLC (USDOT 2956171) with 1 citation, and JDS Pavement Marking and Repair LLC (USDOT 3082822) with 1 citation. The sample is too small to infer fleet-wide trends or to suggest any carrier operates with systemic non-compliance.
Vehicle makes cited include Ford, Pola, Ptrb, and unknown makes—each with 1 citation. This distribution reflects the minimal enforcement volume and does not indicate any particular vehicle platform is more prone to this violation.
How severe is this compared to similar codes
In the hazardous materials category, 172.325A sits at the low end of enforcement and severity. For comparison:
General loading/unloading hazmat violations (codes 177.834A-HMC and 177.834(a)) have accumulated 3,954 and 3,839 citations respectively, with OOS rates of 99.2% and 97.9%. These violations consistently trigger out-of-service orders because they involve fundamental hazmat handling safety.
Placarding violations (code 177.817(a)) show 2,274 citations with a 75.1% OOS rate, reflecting the serious hazard when placards are missing or incorrect. Placard deterioration (code 177.817(e)) has 2,038 citations but only a 5.2% OOS rate—similar to 172.325A in that inspectors rarely ground the vehicle for cosmetic or environmental placard damage.
Placard general requirements (code 172.502(a)(1)) with 1,820 citations shows an 18.5% OOS rate. The data suggests that marking and placard violations vary widely in severity: those affecting cargo identification and load safety net high OOS rates, while those affecting placard condition net lower rates.
172.325A's 0.0% OOS rate indicates inspectors treat this citation as a documentation or labeling correction issue rather than an immediate safety threat warranting vehicle removal from service.
How to avoid it
If you haul elevated-temperature hazmat, protect yourself with these pre-trip and loading-phase checks:
- Verify the "Hot" marking is present and visible on all required surfaces of the shipment or container before you accept load responsibility. Do not rely on the shipper's word—physically inspect it yourself.
- Check hazmat shipping papers before departure to confirm the cargo is classified as elevated-temperature material and that marking requirements are explicitly noted.
- Inspect your placard integrity at the same time. While 172.325A specifically covers the "Hot" marking, missing or damaged placards are cited far more frequently (2,274+ citations in our data) and carry higher OOS risk.
- Keep documentation in your cab that clearly identifies which loads on your vehicle are heated and therefore require the "Hot" marking. This is especially important if you're running a mixed load.
- If you notice a marking missing or degraded during your trip, pull over at a safe location and contact your dispatch or the shipper immediately. Waiting until an inspection catches it creates unnecessary exposure.
Because enforcement is so rare, compliance is likely strong in your carrier network. If you've been cited for 172.325A, the issue usually stems from a single shipment that was not marked correctly by the shipper, or a marking that became obscured in transit. Confirm with your dispatcher that the load was marked when tendered to you, and document that in writing going forward.