FMCSR 172.336(c): ID Number Display — Driver Q&A

No, but it's borderline. Across our inspection records, this violation resulted in an out-of-service order 46.9% of the time—significantly higher than the 31.4% average across all FMCSR codes. While not automatically OOS-eligible, roughly half of drivers cited for 172.336(c) had their vehicle removed from service. Your truck's specific condition and the inspector's findings determine whether you're placed OOS at roadside.

This is among the least-cited hazmat violations in our database—ranked #1775 out of 3,036 FMCSR codes. In comparison, related placard violations like 177.817(a) generate 2,274 citations and trigger out-of-service 75.1% of the time. General loading/unloading violations (177.834A-HMC) have 3,954 citations with 99.2% OOS rates. Your citation is rare, which suggests either strict enforcement at specific terminals or a genuine systemic issue with ID number display.

First steps:

1. Photograph and document the ID number display area before your truck leaves the inspection site.
2. Request a copy of the citation and inspection report.
3. Review the table in 49 CFR 172.336(c) for the specific ID number requirements that apply to your cargo.
4. Check your load documentation against those requirements.
5. Contact your carrier's compliance manager immediately—this code flags a hazmat display failure.
6. Schedule corrective action (repair, relabeling, or documentation correction) before your next haul.

The FMCSA severity weight for this violation is not disclosed in roadside inspection data we track. However, any hazmat citation contributes to your Unsafe Driving and Vehicle Maintenance BASICs depending on the nature of the failure. CSA points accumulate over 36 months and influence carrier safety ratings, audit frequency, and DOT interventions. Your best move is to contact your carrier's safety department or the FMCSA CSA portal to see your current point total and trend.

It's extremely rare right now. Our inspection records show zero citations for 172.336(c) in the last 12 months and zero in the last 90 days. All-time, we've recorded only 32 citations since our database began tracking. This suggests either that ID number display is well-controlled across the industry, or that inspectors rarely prioritize this code during routine checks. If you've just been cited, yours is an outlier event.

Our dataset does not break down state-level citation frequency for 172.336(c) due to the extremely low enforcement volume (32 all-time citations). With such sparse data, state rankings would be unreliable. If you were cited in a specific state, contact your state's highway patrol or that state's commercial vehicle enforcement division to understand their policy on ID number display checks.

Yes. The FMCSA DataQs (DataQuality.fmcsa.dot.gov) system allows drivers and carriers to challenge roadside inspection records within 90 days of the citation date. For a 172.336(c) violation (a documentation/display issue), you can contest by:

1. Submitting photographic evidence that ID numbers were correctly displayed.
2. Providing load documentation showing compliance with 172.336(c) requirements.
3. Arguing that the inspection was inaccurate (wrong cargo type, misread markings, etc.).

DataQs requires your FMCSA PIN and detailed evidence. Success rates improve when you can prove the violation was not factual.

Across our 13 million inspection records, TFORCE FREIGHT INC (USDOT 121058) has the highest count with 4 citations for 172.336(c). DANIEL CANO GARCIA (USDOT 3709951) follows with 2 citations. All other carriers—MID THUMB TRUCKING CO, B & B OIL CO INC, KENDRICK OIL CO, TA OPERATING LLC, STERICYCLE INC, C & R DISTRIBUTING LLC, KEY PERFORMANCE PETROLEUM COMPANY, and MISSION PETROLEUM CARRIERS INC—have 1 citation each. The pattern suggests this is an isolated compliance issue rather than a fleet-wide trend.