What 172.400A means in plain language
Your citation for 172.400A addresses the labeling of hazardous material packages. Federal regulations require that every package containing hazardous materials display the correct hazard class label on the outside. These labels communicate the specific danger—whether the contents are flammable, toxic, corrosive, radioactive, or fall into another hazard class.
The violation occurs when a hazmat package arrives at an inspection without the proper label, or with a label that doesn't match the hazard class of the contents inside. Inspectors check the label against the shipping papers and the actual commodity to ensure they all align. This is a foundational safety rule: handlers, transporters, and first responders depend on accurate labeling to know what they're dealing with and how to handle an emergency.
It's not about the placard on the truck itself (that's a different code). This violation is specifically about the label on each individual package or container of hazardous material in your load.
What our enforcement data actually shows
Across our 13 million inspection records, 172.400A citations are relatively uncommon. All-time, we have logged 109 citations for this violation. In the last 12 months, enforcement volume was 64 citations, and in the last 90 days, 9 citations appeared in our database.
What stands out is the out-of-service rate. Only 1 out of 108 loads cited for 172.400A was placed out of service—a rate of 0.9%. This is dramatically lower than the all-FMCSR average OOS rate of 31.4%. This code does not result in immediate removal from service in the vast majority of cases. However, a citation will still impact your safety rating and your carrier's CSA scores, with a severity weight of 5.
Ranked #1391 of 3,036 FMCSR codes by citation volume, 172.400A enforcement is infrequent compared to many other violations. But when you're the driver cited, frequency doesn't matter—you're dealing with the consequences now.
Who gets cited most
Our inspection records show that Texas accounts for the largest share of 172.400A citations in the last 180 days, with 16 citations and a 0.0% OOS rate. Illinois follows with 2 citations and a 0.0% OOS rate. Iowa reported 1 citation with 0.0% OOS, and New Mexico reported 1 citation with 0.0% OOS.
The geographic concentration in Texas reflects both the volume of hazmat transport through that state and inspection activity there. The fact that all top-state OOS rates sit at 0.0% is consistent with the national pattern: this violation rarely results in immediate out-of-service action.
Our data shows that hazmat carriers of all sizes see these citations. Several carriers, including ACME Truck Line Inc, EAR Telecommunications LLC, and Conatser Construction TX L P, each appeared in our records with 3 citations. This does not indicate a pattern of negligence—it reflects the volume of hazmat shipments these fleets handle and the frequency of inspection exposure.
How severe is this compared to similar codes
172.400A sits in the Hazardous Materials category alongside several other labeling and placarding violations. The severity difference is striking.
General loading and unloading hazmat violations (177.834A-HMC) generated 3,954 citations all-time with a 99.2% OOS rate—nearly all loads are removed from service. Placarding violations (177.817A) show 2,274 citations with a 75.1% OOS rate. Even within the labeling family, placarding violations tend to result in immediate out-of-service action far more often.
By contrast, 172.400A's 0.9% OOS rate reflects that the violation is typically a documentation or labeling error rather than an immediate safety emergency. However, the CSA severity weight of 5 still applies to your record, meaning this violation counts meaningfully in safety audits and carrier safety profiles.
How to avoid it
Before you load:
- Cross-check the bill of lading or shipping manifest against each hazmat package. Verify that the label printed on the package matches the hazard class listed in your paperwork.
- If a package is missing a label or the label is blank, faded, or illegible, do not load it. Contact the shipper immediately and request a properly labeled package.
- Familiarize yourself with the nine hazard classes (explosive, flammable liquid, flammable solid, oxidizer, poison, radioactive, corrosive, miscellaneous) and their standard label colors and symbols so you can spot mismatches quickly.
During pre-trip inspection:
- Walk the load and visually inspect every hazmat package label. Make this a routine checkpoint, just like checking tire condition.
- Document what you see in writing if you spot any labeling discrepancies. This protects you and your carrier.
- If you notice that a hazmat package lacks a label or has the wrong one, do not depart. Notify your dispatcher or compliance team.
Co-occurring pattern insight: Our inspection data shows that 172.400A commonly appears alongside placarding violations (177.817A) and general loading/unloading issues (177.834A) in the same inspection. This suggests that labeling oversights often occur when hazmat loads are assembled or documented carelessly. Treat package labeling as a critical first step, not an afterthought. When labels are right at the package level, placarding and loading procedures tend to align too.
Vehicle makes with the highest citation counts in our database include Ford, Freightliner, and Dodge. This likely reflects the prevalence of these models in commercial trucking rather than a defect-based risk, but it reinforces that hazmat compliance is a driver and fleet responsibility, not a vehicle-dependent factor.