What 172.400 means in plain language
FSMCR 172.400 requires that packages containing hazardous materials display the correct hazard class label on their outer surfaces. This label communicates the type of danger the material poses—whether it's flammable, corrosive, toxic, radioactive, or another hazard class—so that anyone handling, transporting, or inspecting the shipment immediately knows what they're dealing with.
If a package of hazmat passes through your truck without the proper label affixed, or with an incorrect or missing label for the contents inside, you're in violation of this rule. The label itself is separate from placard requirements for vehicles; this is about marking the individual package or container.
The regulation applies to any driver or fleet moving packages of hazardous materials across state lines or in commerce. Shippers are responsible for labeling before the load reaches you, but as the driver, you're expected to visually verify that the packages are properly labeled during pre-trip and throughout transport.
What our enforcement data actually shows
Our inspection records show zero citations for FMCSR 172.400 across our entire database of 13 million+ roadside inspections. In the last 12 months and last 90 days, our data indicates zero enforcement actions under this specific code.
Because there are zero citations on record, the out-of-service rate is 0.0%—meaning this code has not resulted in vehicles being placed out of service. This doesn't mean the rule isn't important; it reflects the way hazmat compliance is typically enforced through related codes that address labeling and placarding more frequently in the field.
The absence of citations for this code is notable when compared to enforcement patterns across the hazardous materials category. While 172.400 itself shows no citation history in our database, related hazmat violations are cited far more often, suggesting inspectors may be catching labeling deficiencies under broader or more frequently cited codes rather than this specific provision.
Who gets cited most
With zero citations for FMCSR 172.400 in our database, there are no top states or top carriers to report for this code. This historical data pattern means you are unlikely to encounter an inspector specifically citing this violation at roadside, though hazmat package and placard violations remain a significant enforcement focus in the hazardous materials category overall.
How severe is this compared to similar codes
Across our inspection records, related hazmat codes show dramatically higher enforcement activity. Our data shows that 177.834A-HMC (General loading/unloading hazmat) was cited 3,954 times with a 99.2% out-of-service rate. Similarly, 177.834(a) (General loading/unloading hazmat) received 3,839 citations with a 97.9% out-of-service rate.
Placarding-specific violations are also heavily enforced: 177.817(a) (Placarding violation) was cited 2,274 times with a 75.1% OOS rate, and 172.502(a)(1) (Placarding general requirements) accumulated 1,820 citations with an 18.5% OOS rate. These peer codes demonstrate that hazmat labeling and placarding remain high-priority enforcement areas, even though 172.400 itself has not appeared in citation records.
The severity weight assigned to 172.400 is 5 on the CSA scale, reflecting the serious safety implications of improperly labeled hazmat packages. A package with missing or incorrect hazards labeling can lead to mishandling, incompatible storage, emergency response errors, and worker or public injury.
How to avoid it
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Verify package labels during pre-trip and load inspection. Before you accept a hazmat load, physically inspect every package or container. Confirm that each one bears a label matching the hazard class of its contents. If a label is missing, illegible, or incorrect, refuse the load and report it to the shipper or dispatcher immediately.
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Cross-reference shipping documentation with packages. Hazmat shipping papers and manifests list the proper hazard class labels required. Use these documents as your checklist during your pre-trip walk-around. Any mismatch between the label on the package and the hazard class on the paperwork is a red flag.
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Report damaged or deteriorated labels. If you discover during transport that a label has faded, peeled, or been damaged, stop safely and contact your dispatcher or the hazmat specialist on your team. Do not continue moving a mislabeled or unlabeled hazmat package.
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Understand the nine hazard classes. Familiarize yourself with the nine DOT hazard classes (explosives, gases, flammable liquids, flammable solids, oxidizers, poisons, radioactive materials, corrosives, and miscellaneous hazards). This knowledge helps you spot obviously incorrect or missing labels during your inspection.
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Never assume the shipper got it right. Even though shippers are responsible for labeling, your observation at roadside is often the last line of defense before a mislabeled package causes a problem. Your visual verification is critical to safe transport.