What 172.401(b) means in plain language
172.401(b) governs the proper description and documentation requirements for hazardous materials in shipments. When you transport hazmat, the shipping papers, package markings, labels, and placards must all align with the official hazmat classification system. This code specifically addresses how shippers and carriers document what's in the load.
In practical terms: if you're hauling hazmat, the paperwork traveling with your truck must accurately describe the material by its proper shipping name, hazard class, and UN number. Discrepancies between what the paperwork says and what the labeling or placarding reflects create a violation of this rule. It's a documentation and accuracy requirement that starts with the shipper but applies to you as the carrier—you're responsible for recognizing if something doesn't match.
What our enforcement data actually shows
Across our 13 million+ inspection records, 172.401(b) has been cited only once in our entire database. That single citation resulted in zero out-of-service orders, giving this code a 0.0% out-of-service rate—substantially lower than the all-FMCSR average of 31.4%. In the last 12 months, we recorded zero citations for this code, and zero in the last 90 days.
This extremely low enforcement volume ranks 172.401(b) at #2796 out of 3,036 FMCSR codes by citation frequency. The rarity of citations for this specific provision suggests that most hazmat shipments are properly documented, or that roadside inspectors encounter other, more common hazmat violations first. That said, when this code does appear, the inspector found the documentation issue serious enough to document it.
Who gets cited most
Our records show that Keeler Ridgefield B LLC (USDOT 3999575) appears once in our database with a 172.401(b) citation. With only one citation on record for this code nationwide, there is no meaningful state-by-state or multi-carrier comparison to report. The single citation involved a RAM vehicle.
The scarcity of enforcement data here means you should not assume this rule is unmonitored—rather, it suggests that compliance is generally strong or that violations are caught upstream at the shipper/packaging stage before reaching a roadside inspection.
How severe is this compared to similar codes
Hazmat documentation and placarding violations span a range of severity in our data. Some peer codes in the hazmat category show vastly different enforcement patterns:
177.834A-HMC (general loading/unloading hazmat) has 3,954 citations with a 99.2% out-of-service rate—by far the most aggressive enforcement action we see. 177.817(a) (placarding violation) has 2,274 citations and a 75.1% OOS rate. Even 172.502(a)(1) (placarding general requirements), which is also documentation-focused, shows 1,820 citations with an 18.5% OOS rate.
By contrast, 172.516(c)(6) (placard damaged, deteriorated, or obscured) has 1,796 citations but only a 1.6% OOS rate, and 172.602(c)(1) (maintenance and accessibility of Emergency Response information) has 1,464 citations with a 0.0% OOS rate. The 172.401(b) profile—single citation, no OOS action—aligns with the lower-enforcement-frequency documentation codes, though the tiny sample size makes direct comparison less meaningful.
How to avoid it
Since 172.401(b) focuses on the accuracy and alignment of hazmat shipping documentation, your prevention strategy centers on verification and attention to detail:
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Review all shipping papers before loading. Match the proper shipping name, hazard class, and UN number on the bill of lading to the labels and placards on the package or container. If anything looks inconsistent, contact the shipper before accepting the load.
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Verify package labels and placards match the paperwork. Walk around the vehicle and confirm that every hazard class label and placard reflects what the shipping papers say. Don't assume the loader got it right.
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Confirm Emergency Response information is on hand. Keep the Safety Data Sheet (SDS) or Emergency Response Guidebook accessible in your cab. Inspectors may verify that you can produce this documentation.
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Never accept a load with missing or illegible documentation. If shipping papers are damaged, faded, or incomplete, refuse the load and request corrected paperwork. A few minutes of delay at pickup beats a citation and potential OOS order on the road.
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Know your vehicle's placard locations. Placards must be visible and properly positioned on all four sides of a hazmat vehicle. Before each trip, confirm they are there, straight, and legible.
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Ask questions if you're unsure about the material. If the hazard class seems wrong for what you're seeing, or if the paperwork is unclear, call dispatch or the shipper. Your job is to transport it safely and legally, not to second-guess—but only if the paperwork is in order first.