What 172.323B-HMM means in plain language
FMCSR 172.323B-HMM addresses hazardous materials shipping paper requirements. Specifically, it covers the proper documentation and labeling standards that must accompany hazmat shipments during transport. Drivers and carriers are required to maintain accurate, legible, and complete shipping papers that identify the hazardous materials being transported, their proper shipping names, hazard classes, and emergency response information.
If you've been cited for this violation, an inspector found that your shipping papers did not meet the regulatory standard—either they were missing, incomplete, illegible, or inaccurate in describing the hazmat load. This is a documentation compliance issue, not a vehicle safety defect.
What our enforcement data actually shows
Across our 13 million+ inspection records, 172.323B-HMM is rarely cited. We have recorded just 1 citation all-time for this code, with 1 citation in the last 12 months and 0 citations in the last 90 days. This code ranks #2796 of 3,036 FMCSR codes by citation volume, making it exceptionally uncommon in roadside enforcement.
The out-of-service rate for 172.323B-HMM stands at 0.0%—meaning the single citation on record did not result in an out-of-service order. For context, the all-FMCSR average OOS rate is 31.4%, so this violation is treated as a correctable violation rather than an immediate safety removal trigger.
Who gets cited most
Our inspection records show that the single citation for 172.323B-HMM occurred in Oklahoma, with 1 citation and a 0.0% OOS rate. Because citation volume for this code is extremely low, geographic patterns are not yet established across multiple states.
Our data shows Mia Transport LLC (USDOT 3600801) with 1 citation for this code. This single citation does not indicate a fleet-wide compliance pattern; rather, it represents an isolated incident.
How severe is this compared to similar codes
Hazmat-related violations span a wide enforcement spectrum. Our data reveals substantial variation:
177.834A-HMC (General loading/unloading hazmat) has been cited 3,954 times with a 99.2% OOS rate—the most serious peer code. 177.817(a) (Placarding violation) shows 2,274 citations with a 75.1% OOS rate. By contrast, 172.502(a)(1) (Placarding general requirements) has 1,820 citations but only an 18.5% OOS rate, and 172.602(c)(1) (Maintenance/accessibility of Emergency Response information) shows 1,464 citations with a 0.0% OOS rate.
172.323B-HMM's 0.0% OOS rate aligns with documentation and emergency response-type violations rather than active loading or placarding defects. This suggests inspectors view it as a paperwork correction opportunity rather than an immediate safety threat.
How to avoid it
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Pre-trip document review: Before accepting any hazmat load, physically inspect shipping papers for legibility, completeness, and accuracy. Ensure the proper shipping name, hazard class, UN number, and packing group are clearly printed and match the cargo inside the vehicle.
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Verify emergency response information: Confirm that current Safety Data Sheets (SDS) or Emergency Response Guides are aboard and accessible. Check dates and ensure they are not damaged or faded.
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Cross-check labels and papers: Match every hazmat label, placard, and marking on the vehicle to the corresponding entry on the shipping papers. A mismatch flags a documentation error.
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Know your load before departure: Ask the shipper or broker to walk you through the hazmat classification and documentation. If you don't understand the papers, don't move the vehicle—clarify it on the dock.
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Keep papers in the cab: Store shipping papers in a location that is easily accessible to you and to inspectors—typically in a folder on the dashboard or visor. Papers that are buried or difficult to locate invite citations.
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Report discrepancies immediately: If you notice any error in the shipping papers after loading, stop and contact your dispatcher or the shipper before moving. Transporting incorrect or incomplete paperwork is the violation.