What 172.406D means in plain language
172.406D addresses hazardous materials documentation and placarding requirements for vehicles transporting regulated goods. This code ensures that drivers and carriers maintain proper written records, labeling, and communication protocols when hazmat is aboard—critical safeguards for public safety and regulatory compliance.
When an inspector cites 172.406D, they've found a deficiency in how your hazmat shipment was labeled, documented, or communicated before or during transport. This might involve missing or incorrect placard information, failures to provide required shipping papers to the driver, or gaps in the hazard communication system that alerts emergency responders to what you're carrying.
What our enforcement data actually shows
Across our 13 million+ roadside inspection records, 172.406D is exceptionally rare. We've recorded only 3 all-time citations for this code, with 2 citations in the last 12 months and 1 in the last 90 days. None of those 3 citations resulted in an out-of-service order—giving this code a 0.0% OOS rate.
To put that in perspective: the all-FMCSR average OOS rate is 31.4%. At 0.0%, 172.406D sits well below that threshold, suggesting that when this violation is cited, it's typically treated as a correctable administrative issue rather than an immediate safety threat warranting vehicle removal. Nationally, 172.406D ranks #2,551 out of 3,036 FMCSR codes by citation volume—a bottom-tier enforcement target.
Who gets cited most
Our inspection records show that Texas accounted for 2 citations in the last 180 days, both with 0% OOS rates. The scarcity of citations for this code means geographic clustering is minimal; enforcement is sparse nationwide rather than concentrated in a few states.
Among carriers in our database, single citations appear across a small and dispersed group. The data shows fleets such as Best Express Enterprises LLC with 1 citation. No pattern of repeat violations emerges from our records.
How severe is this compared to similar codes
172.406D sits in the hazardous materials category alongside several much more heavily enforced peer codes. For context:
- 177.834A-HMC (General loading/unloading hazmat) carries 3,954 citations with a 99.2% OOS rate—one of the harshest enforcement profiles in the entire FMCSR database.
- 172.502(a)(1) (Placarding general requirements) shows 1,820 citations with an 18.5% OOS rate—still 18 times the citation volume of 172.406D.
- 172.516(c)(6) (Placard damaged, deteriorated, or obscured) accounts for 1,796 citations but, like 172.406D, carries only a 1.6% OOS rate, suggesting inspectors view it as correctable.
The data indicates that documentation and communication violations (172.406D) are enforced much less frequently than physical hazmat handling, loading, or placard visibility issues. When they are cited, they rarely trigger immediate vehicle removal.
How to avoid it
Prevent 172.406D citations with these driver-actionable steps:
- Review shipping papers before departure. Verify that the driver's copy of the bill of lading or shipping papers contains all required hazmat information: proper shipping name, hazard class, UN number, and packing group. Do not leave the yard without these details confirmed and legible.
- Verify placards are present and correct. Walk around your vehicle and confirm that all four sides display the appropriate hazmat placard(s) matching the commodity aboard. Placard orientation, color, and legibility all matter. If a placard is damaged, faded, or missing, report it immediately and do not move the vehicle.
- Maintain emergency response information. Ensure the shipping papers, safety data sheets (SDS), or emergency contact information required by the hazmat regulations are accessible to yourself and emergency personnel. Keep these documents in the cab, not buried in the trailer.
- Double-check paperwork before border crossings or state line transfers. Hazmat documentation requirements can vary by jurisdiction. At weigh stations or before crossing state lines, inspect your papers for accuracy and completeness—inspectors often verify hazmat documentation as part of routine stops.
- Request shipper certification. Before accepting a hazmat load, confirm that the shipper has properly certified the shipment. Do not accept responsibility for improperly prepared loads. If paperwork looks incomplete or inconsistent, ask the shipper to correct it on the spot.
Since 172.406D citations are rare and none result in OOS orders in our data, you are not in immediate jeopardy if cited. The inspector is likely signaling an easy fix—correct the documentation or placard issue, provide proof to your carrier and the safety manager, and move on. However, repeated documentation failures can signal carelessness to enforcement and may invite deeper scrutiny on your next stop.