What 172.407B-HML means in plain language
172.407B-HML is a hazardous materials regulation violation related to how certain materials are prepared, packaged, or documented for transport. The regulation covers specific requirements that apply when you're carrying hazmat cargo that falls under this classification.
While the technical details are extensive, the core requirement is ensuring that hazmat packages meet prescribed standards before they enter the transportation network. This includes proper preparation, correct labeling practices, and documentation that reflects the actual contents and hazard class of the material.
If you've been cited for this code, an inspector found that something about how the hazmat was packaged, prepared, or documented didn't meet federal standards at the moment of inspection.
What our enforcement data actually shows
Across our database of 13 million+ roadside inspection records, 172.407B-HML is a relatively uncommon violation. We have logged 6 citations all-time, with 3 citations in the last 12 months and 0 in the last 90 days.
None of the 6 citations resulted in an out-of-service order—the OOS rate for this code is 0.0%. This contrasts sharply with the all-FMCSR average OOS rate of 31.4%, meaning inspectors have not deemed violations of this particular regulation serious enough to sideline vehicles at roadside.
172.407B-HML ranks #2357 out of 3,036 FMCSR codes by citation frequency. The rarity of citations suggests either strong industry compliance or limited enforcement focus on this specific subsection.
Citation activity has been sporadic: 1 citation in May 2025, 1 in June 2025, and 1 in November 2025. This pattern offers no clear seasonal trend.
Who gets cited most
Our inspection records show Louisiana with 1 citation in the last 180 days—the only state with recorded enforcement for this code in that window. The 0.0% OOS rate in Louisiana aligns with the national 0.0% rate for this violation.
Among carriers, Service Electric Company (USDOT 391773) appears in our data with 3 citations all-time. Anderson Distributing LLC (USDOT 3328203), Mako Enterprises LLC (USDOT 4008820), and Booster Energy Inc (USDOT 4179191) each have 1 citation. These numbers reflect historical citation patterns and do not indicate systemic compliance problems—rather, they show which fleets have encountered enforcement activity for this specific code.
How severe is this compared to similar codes
Hazmat packaging and preparation violations span a range of severity levels within the hazardous materials category. Looking at peer codes:
177.834A-HMC (General loading/unloading hazmat) has accumulated 3,954 citations with a 99.2% OOS rate—meaning inspectors almost always remove vehicles immediately. 177.834(a) is similarly serious: 3,839 citations at 97.9% OOS rate.
177.817(a) (Placarding violation) has 2,274 citations at 75.1% OOS rate, still a high-consequence violation.
By contrast, 172.516(c)(6) (Placard damaged, deteriorated, or obscured) has 1,796 citations but only a 1.6% OOS rate—comparable to 172.407B-HML's 0.0% rate.
The data shows that packaging and preparation violations (172.407B-HML) are treated less severely at roadside than major loading/unloading or placarding failures, even within the same hazmat regulatory family.
How to avoid it
Since violations of 172.407B-HML are rare and no co-occurring patterns are established in our data, prevention focuses on best practices in hazmat packaging and documentation:
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Verify packaging before loading: Before the hazmat enters your vehicle, confirm with the shipper that packages meet DOT standards. Look for intact seals, proper closure, and visible damage. Ford vehicles appear in 4 of the 6 citations, but this likely reflects fleet size rather than a vehicle-specific defect—the key is pre-trip inspection regardless of make.
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Check documentation matches cargo: Review the shipping papers against the actual material you're transporting. Mismatches between paperwork and physical hazmat are a common reason inspectors cite preparation violations.
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Know your hazmat classification: Understand the hazard class of materials you carry. Incorrect classification at the shipper level is a root cause of packaging failures.
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Report shipper non-compliance: If you arrive at a pickup and notice hazmat that appears improperly packaged or labeled, refuse the load and report it to your dispatcher and the shipper. You are not responsible for correcting shipper errors, and accepting a non-compliant load exposes you to citation risk.
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Document your pre-trip inspection: Record that you visually inspected hazmat packaging and cross-checked shipping papers. This creates a record that you took reasonable care before accepting the load.
The 0.0% OOS rate suggests that if you are cited for this code, you're unlikely to be removed from service on the spot—but citations still appear on your record and affect your carrier's safety profile, so prevention is preferable to remediation.