What happens when cited for 171.2(b)? Direct answers on OOS risk, severity, and next steps based on 13M+ inspection records.
Ranks #2,502 of 3,146 FMCSR codes by citation frequency • OOS rate of 0.0% is below the FMCSR-wide average of 33.3%.
Failed to comply with exemption
Direct answers grounded in TruckCodex inspection data
No. Across our inspection database, 171.2(b) citations have never resulted in an out-of-service placement. The OOS rate for this violation is 0.0%—all 4 all-time citations resulted in warnings or citations only, not vehicle removals. For context, the average FMCSR violation carries a 31.4% OOS rate, so this code sits well below the enforcement baseline.
It's relatively rare and less severe than many related hazmat violations. Our records show only 4 all-time citations for 171.2(b)—ranking it #2480 of 3,036 FMCSR codes by frequency. By contrast, peer codes like 171.2K-HMGRMC (255 citations, 1.6% OOS rate) and 171.2(k) (155 citations) see far more enforcement. Your violation touches exemption compliance, a narrower subset of hazmat regs than general transportation or documentation failures.
Yes. The DataQs dispute process allows you to challenge roadside inspection findings if there's a factual error—wrong vehicle description, misidentified exemption, or documentation the inspector missed. File within 90 days of the inspection. Since 171.2(b) hinges on exemption compliance, a valid, unexpired exemption letter or special permit approval in your cab at the time of inspection is strong grounds for a correction request. Consult your carrier's compliance team for supporting documentation.
Zero. Our inspection records show no citations for 171.2(b) in the last 90 days, and none in the last 12 months either. The only 4 citations on record are older. This rarity reflects both limited enforcement activity and the specificity of exemption-based violations—they occur when carriers misapply or misunderstand narrow regulatory carve-outs rather than fail at baseline hazmat duties.
Our database records one citation each to four carriers: Carnes Trucking Co Inc (USDOT 278668), Van Dyk Tank Lines Inc (USDOT 1285259), Easy Carrier LLC (USDOT 3734211), and Mountain Movers Engineering Contractors Inc (USDOT 4128730). No single carrier shows a pattern—enforcement is too infrequent to identify a high-risk fleet. Tank and flatbed operators (vehicles cited include Fontaine and Freightliner chassis) appear in the sample, but sample size is too small to draw conclusions.
Hazmat violations like 171.2(b) are attributed to both driver and carrier in FMCSA's Compliance, Safety, Accountability (CSA) program. The citation reflects on the carrier's Hazardous Materials Compliance BASIC and may affect your driver record if you were the operator. The exact CSA points and severity weight depend on the specific exemption and circumstances; your carrier's safety team or a CSA advisor can calculate impact on your or your company's safety profile.
TruckCodex aggregates official public-sector datasets. See the Source registry for dataset-level coverage and the Freshness log for last-import timestamps.
Census, SAFER, SMS, Licensing & Insurance (L&I), roadside inspections, crashes, and authority history.
Vehicle recall campaigns, defect investigations, and consumer safety complaints (SCRS).
Cross-border carrier registry and Canadian recall campaigns where applicable.
TruckCodex is an independent aggregator; it is not affiliated with FMCSA, NHTSA, EIA, or Transport Canada. Always verify compliance-critical information directly with the originating agency.