What 172.203K means in plain language
FMCSR 172.203K addresses hazardous materials paperwork and labeling requirements. Specifically, when you transport materials classified as "not otherwise specified" (n.o.s.), you must include the proper technical name on your shipping documentation and hazmat labels. An n.o.s. entry is a catch-all category the DOT uses when a hazardous material doesn't fit neatly into a named class—it's a real classification, but it requires precise documentation to tell inspectors and emergency responders exactly what they're dealing with.
When an inspector cites 172.203K, they found that your shipping papers, placards, or package labels failed to include the required technical name for an n.o.s. material. This sounds narrow, but it creates real confusion: if your truck is involved in an accident, first responders won't know what chemical they're handling. That's why DOT enforces it.
The violation doesn't automatically put your truck out of service—in fact, across our 13 million inspection records, only 1 out of 47 all-time citations for this code resulted in an out-of-service order. But the citation stays on your record and can contribute to a pattern.
What our enforcement data actually shows
Across our inspection records, 172.203K ranks #1656 out of 3,036 FMCSR codes by citation volume. This is a low-frequency violation: we've recorded 47 all-time citations, with 20 in the last 12 months and 3 in the last 90 days. The out-of-service rate for this code is 2.1%—far below the all-FMCSR average of 31.4%, meaning inspectors almost never pull you off the road for this violation alone.
That said, the citation trend shows a slight uptick: in 2025-08 and 2025-09, we saw 4 citations each month. The last quarter (2026-01 through 2026-03) averaged about 1.7 per month, suggesting enforcement remains scattered and sporadic.
If you were cited in the last 90 days, you're part of a very small group. The infrequency can actually work against you—it means many drivers and carriers don't prioritize n.o.s. documentation, which invites inspector attention when they do find errors.
Who gets cited most
Our inspection records show that Texas dominates 172.203K citations in the last 180 days, with 6 citations and a 0.0% out-of-service rate. Beyond that, the state-level data is sparse—indicating this violation is genuinely rare across the country and not clustered in any particular region.
At the carrier level, our data shows fleets such as DARKHORSE ENERGY SERVICES LLC (USDOT 3356502) and SERVICIO DE TRANSPORTE INTERNACIONAL Y LOCAL SA DE CV (USDOT 557341) with 3 citations each. SYSCO USA I INC, SULTAN TRANS INC, CENTRAL TRANSPORT LLC, and THE HOLBROOK COMPANY INC each recorded 2 citations. These numbers reflect volume—not carrier safety records—and suggest that certain hazmat transporters encounter this rule more often simply because they move n.o.s. materials frequently.
The citation data spans a broad range of vehicle types: freightliners lead with 19 citations, followed by Kenworth trucks (6), and a mix of trailers and other makes. No single vehicle type is disproportionately cited, so the violation isn't tied to equipment design.
How severe is this compared to similar codes
172.203K sits in the hazardous materials category alongside much heavier hitters. For context:
177.834A (General loading/unloading hazmat) has 3,954 citations and a 99.2% out-of-service rate—meaning almost every loader/unloader error lands your truck immediately out of service. That's 84 times more citations than 172.203K.
172.502A1 (Placarding general requirements) has 1,820 citations with an 18.5% out-of-service rate. It's a more common paperwork violation, but still far less frequently cited than general loading violations.
172.602C1 (Maintenance and accessibility of Emergency Response information), a code that co-occurs with 172.203K in 2 inspections we've reviewed, carries 1,464 citations with a 0.0% out-of-service rate—the same as 172.203K—suggesting both are enforcement points rather than immediate safety triggers.
In short: 172.203K is a documentation detail that inspectors flag, but it's not a catastrophic violation like loader/unloader negligence.
How to avoid it
Based on the violations that commonly appear alongside 172.203K in the same inspection, here's what to check:
Pre-trip for n.o.s. materials:
- Match the technical name on your Bill of Lading, shipping papers, and package labels exactly. If the shipper gave you an n.o.s. entry, copy it verbatim—don't abbreviate or interpret.
- Verify that placards match your paperwork. The data shows 172.406A1 (label placement) and 172.516C4 (placard distance from advertising) often appear together with 172.203K, meaning inspectors are scanning your entire hazmat setup when they spot one error.
- Check that Emergency Response information (phone numbers, contact details) is present and legible on or with your papers. This co-occurs in 2 of the 3 citations we've tracked in the last 90 days.
For dispatchers and shippers:
- If you move n.o.s. materials, use a documented checklist for paperwork preparation. The low citation volume suggests many carriers skip this step entirely—don't be one of them.
- Train loaders on the difference between a brand name and a technical name. Confusion here is why 172.202A4 and 172.202B (incomplete descriptions) often co-occur.
General:
- Before accepting a load, inspect the shipping papers yourself. Don't assume the shipper got it right; you're liable if it's wrong.
- If you're unsure whether a material is classified as n.o.s., ask the shipper for clarification in writing before you move it.
This violation is rare enough that a single citation may not trigger major carrier penalties, but it's also a signal that your paperwork process has a gap. Fix it now, and you'll avoid repeat citations and the frustration of a roadside stop.