What 172.202A4 means in plain language
When you transport hazardous materials, federal law requires shipping papers that describe the cargo with precision. The description must include the proper shipping name, hazard class, UN/ID number, and packing group—all the information that first responders and other parties need to handle or manage the material safely.
A 172.202A4 citation means your shipping papers were missing one or more of these required elements. This isn't a minor paperwork gap. Incomplete hazmat descriptions create real risk: emergency crews won't know what they're dealing with if something goes wrong, and shippers and receivers can't verify they're handling the right product or taking the right precautions.
The citation applies to the shipping papers you had in the cab at the time of inspection—the documents that travel with the load and prove compliance with hazmat labeling and documentation rules.
What our enforcement data actually shows
Across our 13 million+ inspection records, we've identified 121 all-time citations for 172.202A4. In the last 12 months, we recorded 81 citations, with 20 in the last 90 days alone. This code ranks #1369 out of 3,036 FMCSR codes by citation volume—a relatively infrequent violation overall, but one that inspectors do catch.
The good news: out-of-service placement is uncommon for this violation. Across all citations, only 2 drivers were placed out of service, yielding a 1.7% OOS rate. For context, the all-FMCSR average OOS rate is 31.4%, meaning 172.202A4 violations result in out-of-service orders far less often than the typical FMCSR code. Most citations result in a warning or a fine, not a roadside shutdown.
However, our 90-day trend shows uptick: February 2026 alone brought 14 citations, and the monthly average over the past year hovers around 6–7 per month. If you're hauling hazmat regularly, this is a violation to take seriously in your pre-trip routine.
Who gets cited most
Our inspection records show Texas leads by a wide margin. In the last 180 days, Texas accounted for 33 citations with a 3.0% OOS rate. New Mexico followed with 4 citations and no out-of-service placements, and North Carolina had 1 citation with no OOS.
Among carriers, our data shows fleets such as Central Transport LLC (USDOT 661173) with 20 all-time citations for this code—notably higher than any other carrier in our database. This pattern does not imply systemic negligence but rather reflects exposure: larger fleets moving more hazmat loads encounter more inspection touchpoints and have more opportunity for citation. Smaller operators or those running fewer hazmat loads appear less frequently in the citation log.
How severe is this compared to similar codes
172.202A4 sits within the broader hazmat documentation and placarding category. When you compare it to related violations:
- 177.834A-HMC (General loading/unloading hazmat) has 3,954 citations with a 99.2% OOS rate—far more common and nearly always grounds for shutdown.
- 177.817(a) (Placarding violation) has 2,274 citations with a 75.1% OOS rate—also much more likely to result in out-of-service.
- 172.516(c)(6) (Placard damaged, deteriorated, or obscured) has 1,796 citations but only a 1.6% OOS rate, similar in severity to 172.202A4.
Your citation is less severe than most hazmat violations. It's a documentation error rather than a physical safety defect, and it rarely triggers a roadside removal. That said, it signals incomplete preparation and creates liability if an incident occurs.
How to avoid it
Our inspection data reveals patterns in how this violation co-occurs with other citations. In the last 90 days, 172.202A4 appeared alongside 172.202A3 (another hazmat description incomplete code) in 8 shared inspections, and alongside 172.201D (hazmat shipping paper format incorrect) in 4 shared inspections. This tells us that when one description element is missing, inspectors often find multiple documentation gaps on the same load.
Here's what to do before you roll:
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Verify the shipping paper description for every hazmat product. Before accepting the load, physically match the description on the paper to the product: proper shipping name (not a trade name), hazard class (e.g., Class 3, Class 8), UN/ID number (e.g., UN1993), and packing group (I, II, or III). Don't assume the shipper got it right.
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Cross-check against the manifest and placards. The description on the shipping paper must align with the placard category and the bill of lading. Mismatches are red flags.
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Carry a hazmat reference guide in your cab. Refer to the DOT Emergency Response Guidebook or your company's hazmat manual during your pre-trip. A quick lookup takes seconds and catches omissions before an inspector does.
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Confirm format compliance on longer routes. If your haul crosses state lines or involves multiple stops, ask the shipper or dispatcher to confirm that all required fields are present and legible. Faded or incomplete printing causes citations too.
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Ask your fleet safety manager for a hazmat documentation checklist. Make it a habit: before you leave the dock, check off proper shipping name, hazard class, ID number, packing group, and total quantity. One extra minute of diligence prevents a citation.
Our data shows that most drivers cited for 172.202A4 are not placed out of service on the spot, but the citation still counts against your safety record and your company's CSA scores. Prevention is always cheaper than remediation.