What 172.322(c) means in plain language
FMCSR 172.322(c) addresses specific requirements for hazardous materials documentation and marking. The regulation requires that certain hazardous materials shipments meet precise labeling and identification standards before they can be transported. When an inspector cites this code, they've found that a shipment or vehicle didn't meet the required marking or documentation criteria for the hazardous material being transported.
This isn't about whether you're carrying hazmat—it's about whether the material itself was properly identified and marked according to federal rules. The distinction matters: you could be legitimately transporting a hazardous material, but if the shipper failed to mark or label it correctly, your vehicle becomes the violation point.
What our enforcement data actually shows
Across our 13 million+ inspection records, 172.322(c) is extremely rare. We've recorded only 2 all-time citations for this code, with zero citations in the last 12 months and zero in the last 90 days. It ranks #2651 out of 3,036 FMCSR codes by citation volume.
The out-of-service rate for 172.322(c) is 0.0%—neither of the two drivers cited were placed out of service. This contrasts sharply with the all-FMCSR average OOS rate of 31.4%, indicating that when this code is enforced, inspectors typically see it as a documentation or marking issue rather than an immediate safety threat that removes the vehicle from service.
The rarity of this citation suggests one of two things: either the industry is following this requirement very carefully, or inspectors are less likely to cite it compared to other hazmat violations. Either way, the enforcement pressure on this specific code is minimal.
Who gets cited most
Our data is limited here because only 2 citations exist in our database. The carriers cited were TFORCE FREIGHT INC (USDOT 121058) with 1 citation and KEEN TRANSPORT & LOGISTICS INC (USDOT 3008274) with 1 citation. The vehicle makes involved were FREIGHTLIN trucks (2 citations) and a single HYUNDAI TR and WABASH NAT trailer.
With such small numbers, we cannot identify state patterns or make meaningful comparisons across carriers. This code is simply too infrequently cited to build a geographic or fleet-specific risk profile.
How severe is this compared to similar codes
Hazmat violations span a wide range in terms of enforcement intensity. Looking at related codes in the hazardous materials category:
177.834A-HMC (general loading/unloading hazmat) has been cited 3,954 times with a 99.2% out-of-service rate—reflecting the critical safety nature of improper handling. 177.834(a) (also general loading/unloading) shows 3,839 citations and a 97.9% OOS rate. These codes are enforced heavily and almost always result in removal from service.
177.817(a) (placarding violation) records 2,274 citations with a 75.1% OOS rate, still a serious enforcement pattern. By contrast, 172.502(a)(1) (placarding general requirements) has 1,820 citations but only an 18.5% OOS rate—suggesting that some placard-related issues are treated as documentation problems rather than safety threats.
172.322(c) sits at the extreme low end of enforcement volume and severity, indicating it's not a code inspectors prioritize or that industry compliance is very high.
How to avoid it
Because this code addresses how hazardous materials are marked and documented before they reach your vehicle, much of the prevention work happens with your shipper, not just your own actions. However, you have real leverage at the pre-trip inspection:
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Verify hazmat paperwork before loading. Review the shipping papers and ensure the material description, proper shipping name, hazard class, and UN number are clearly printed and match the physical package or container you're about to load.
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Inspect labels and placards on containers. Before accepting a shipment, confirm that all required labels are present, legible, and correctly positioned. Damaged, faded, or missing labels are a red flag—refuse the load or request the shipper correct it.
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Cross-check the manifest against the vehicle markings. If your vehicle displays hazmat placards, make sure they match the materials actually being transported. A mismatch between what the shipper says is in the truck and what the placards indicate is a violation waiting to happen.
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Ask the shipper for certification. If you're unsure whether materials are marked correctly, ask the shipper to confirm they've complied with labeling requirements. Don't assume—get it in writing if possible.
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Walk around and look. Spend two minutes visually inspecting the exterior of packages, drums, boxes, or containers. Look for faded labels, torn edges, or missing information. Your eyes are your first defense.
The good news: this code is almost never cited. The better news: you can make it zero for yourself by confirming hazmat documentation and markings match reality before you roll.