What 172.402B-HML means in plain language
This citation means a hazardous material in your truck was not properly labeled with its hazard class or division. When you transport hazmat, every package, container, or tank must carry a label that clearly identifies what type of hazard it poses — whether it's flammable, toxic, corrosive, or something else.
The hazard class or division is the core piece of information on that label. Without it, first responders, inspectors, and other handlers cannot instantly identify the danger. A label without the class or division is essentially incomplete and defeats the purpose of the labeling system.
This applies whether you're hauling drums, boxes, tanks, or any other container of regulated hazmat. The label must be visible, legible, and must include the hazard classification.
What our enforcement data actually shows
Across our 13 million+ inspection records, 172.402B-HML is exceedingly rare. We have recorded 5 citations all-time, with 5 citations in the last 12 months and 0 in the last 90 days. This code ranks #2406 out of 3,036 FMCSR codes by citation frequency.
More importantly for your situation: none of the 5 citations resulted in an out-of-service order. The OOS rate is 0.0%. This contrasts sharply with the all-FMCSR average OOS rate of 31.4%. In practical terms, inspectors are treating this as a labeling deficiency that requires correction but not immediate vehicle removal from service in most cases.
The rarity of this citation suggests that either drivers are generally compliant with hazmat labeling rules, or inspectors encounter this violation so infrequently that enforcement remains low. Either way, if you've been cited, you are in a small subset of traffic.
Who gets cited most
Our inspection records show citations for 172.402B-HML concentrate in a very small geographic footprint. In the last 180 days, Connecticut reported 1 citation with a 0.0% OOS rate.
Because the total citation volume is so low, no other states appear in the top states list. This violation is not evenly distributed across the country; it appears to occur sporadically based on where and when inspectors encounter mislabeled hazmat shipments.
How severe is this compared to similar codes
Within the hazardous materials category, labeling and placarding violations span a wide severity range. Our data shows:
- 177.834A-HMC (General loading/unloading hazmat) has 3,954 citations with a 99.2% OOS rate — far more aggressive enforcement.
- 172.502(a)(1) (Placarding general requirements) has 1,820 citations with an 18.5% OOS rate — more common but still more likely to result in OOS placement than 172.402B-HML.
- 172.516(c)(6) (Placard damaged, deteriorated, or obscured) has 1,796 citations with a 1.6% OOS rate — similarly lenient to your citation.
Your citation sits at the low end of enforcement severity within the hazmat category. The 0.0% OOS rate indicates inspectors view labeling defects as correctable without immediately removing the vehicle.
How to avoid it
Before you load:
- Verify every hazmat package or container you receive already has the manufacturer's label affixed and legible. Check that the label displays the hazard class number or division clearly — it should be prominent on the diamond-shaped or rectangular label.
- If a label is missing, faded, or illegible, do not accept the shipment or apply a replacement label yourself only if you are trained and authorized to do so. In most cases, the shipper must provide compliant labeling.
- Keep a pre-trip checklist that includes a visual inspection of all hazmat labels on your load. Make this a routine step, not an afterthought.
During your trip:
- Before departing, walk your vehicle and confirm every container or tank displays its hazard class or division label.
- At rest stops or after any movement, do a quick visual check that labels remain attached and visible. Vibration and weather can loosen or damage labels over time.
- If you discover a missing or illegible label en route, stop and contact your dispatcher or the shipper immediately. Do not proceed with an unlabeled or unclearly labeled shipment.
Documentation:
- Keep a record (photo or written note) of your pre-trip hazmat label verification. This protects you if an inspector questions whether the label was present when you departed.
- If you transport hazmat regularly, familiarize yourself with the standard hazard class symbols and numbers so you can quickly verify they are present.
The rarity of this citation suggests that most drivers are compliant. Stay consistent with label verification, and you are unlikely to encounter this violation again.