What 172.302A means in plain language
Bulk packaging—tanks, drums, and other large containers carrying hazardous materials—must display an identification number in a specific location and format. This ID# is the DOT hazard class code that tells emergency responders, inspectors, and other drivers what's inside and how dangerous it is.
When an inspector finds a bulk container without that number properly displayed, or with a number that's missing, illegible, or incomplete, you've violated 172.302A. It doesn't matter if the placard is there. The ID# is a separate requirement. Think of it as a safety label's foundation—regulators can't quickly identify the exact hazard without it.
This citation shows up most often on tank trucks and specialized bulk carriers. It's not about transporting hazmat unsafely per se; it's about failing to label it so that responders know what they're dealing with if something goes wrong.
What our enforcement data actually shows
Across our 13 million+ inspection records, 172.302A is relatively uncommon. We've logged 36 all-time citations, with 16 in the last 12 months and just 1 in the last 90 days. That makes it ranked #1727 out of 3,036 FMCSR codes by citation volume.
But the enforcement is serious when it happens. Our data shows a 58.3% out-of-service rate for this violation—meaning nearly 6 out of 10 trucks cited for 172.302A get placed out of service on the spot. That's significantly higher than the all-FMCSR average of 31.4%, indicating inspectors treat missing or illegible ID# numbers as a high-priority safety concern.
In the last 12 months, citations have clustered in specific months. We saw a spike in September and October 2025, with 3 and 4 citations respectively, each generating multiple out-of-service placements. This suggests targeted enforcement sweeps or seasonal hazmat transport surges in certain regions.
Who gets cited most
Texas dominates the citation record for 172.302A. Over the last 180 days, we've recorded 6 citations in Texas, with 5 resulting in out-of-service orders—an 83.3% OOS rate. This is notably higher than the national average for this code, reflecting either higher inspection intensity, higher traffic volume of bulk hazmat carriers, or both.
Our all-time carrier data shows DARKHORSE ENERGY SERVICES LLC (USDOT 3356502) with 2 citations—more than any other fleet in our records. All other carriers with citations had single instances. This doesn't imply systemic negligence at any one carrier; it reflects the rarity of this violation overall. The vast majority of bulk hazmat operators get the ID# right.
How severe is this compared to similar codes
Within the hazardous materials enforcement space, 172.302A is far less common than major placarding and loading violations, but it sits on a spectrum.
Compare it to 177.817(a)—a placarding violation—which accounts for 2,274 citations in our database with a 75.1% OOS rate. Or 172.516(c)(6), placard deterioration, which has 1,796 citations but only a 1.6% OOS rate. The 58.3% OOS rate for 172.302A suggests inspectors view a missing ID# as more serious than a damaged placard, but less critical than a general placarding failure.
The most severe peer codes—177.834A-HMC and 177.834(a), both covering general hazmat loading and unloading—show OOS rates of 99.2% and 97.9% respectively, with thousands of citations. Those are violations that put the public at immediate risk. 172.302A, by contrast, is an identification and documentation issue, but one that still triggers out-of-service action in the majority of cases.
How to avoid it
If you transport bulk hazmat, a pre-trip inspection must include a verification step for ID#s:
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Check every bulk container before you leave the facility. The ID# must be clearly visible, in the right location on the container, and legible from a reasonable distance. If it's faded, covered, or missing, don't leave. Contact the shipper or facility to have it corrected or re-marked.
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Know the difference between placards and ID#s. A placard is the diamond-shaped label showing hazard class. The ID# is the four-digit DOT commodity code. You need both. A placard alone is not enough to meet 172.302A.
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Inspect for damage to the ID# during your trip. Rain, road dirt, and vibration can obscure numbers. On longer hauls, a quick walk-around inspection—especially after rough roads or weather—can catch deterioration before an inspector does.
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Review the shipping papers against the container. The ID# on the tank or drum should match the hazmat class code on your papers. If there's a mismatch or the number is missing, it's a red flag that paperwork and packaging aren't aligned.
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Work with shippers to confirm marking standards. If you work with a small or unfamiliar shipper, ask how they mark their bulk containers and verify it meets DOT requirements. Many citations happen because a shipper prepared the shipment incorrectly, and the driver didn't catch it.
Our co-occurrence data shows 172.302A frequently appears alongside other labeling violations—172.406A1 (label placement), 172.516C6 (placard damage), and 177.817A (placarding violations). This pattern tells us that when one label or marking element is wrong, others often are too. A thorough visual inspection of the entire bulk container—every side, top, and marking surface—catches multiple issues at once and keeps you compliant.