Where the line is strictest.
The out-of-service rate measures how often an inspection ends with a vehicle or driver pulled off the road — per 1,000 inspections. The map runs cool where enforcement clears most rigs and hot where it doesn't.
The map gets granular.
Zoom from states down to individual counties. Inspection corridors and weigh-station counties light up; rural counties with only a handful of inspections are held back so a single bad stop can't paint a whole county red.
Counties with fewer than 25 inspections this month (1,345 of 2,643) are shown in a neutral fill — their per-1,000 rates swing wildly on tiny samples and aren’t comparable.
What inspectors write up.
The top violation codes by citation count, with the share that converted to an out-of-service order. A high conversion means the violation almost always parks the truck — tire and brake defects sit at the top.
Violation detail runs about four weeks behind inspection volume — these citations cover August 2026. OOS conversion above ~90% (shown in red) means the citation almost always ends the trip.
One category dominates.
Every roadside violation rolls up into one of six CSA BASIC categories. Across the whole month, vehicle-maintenance defects swamp everything else — the truck, not the driver, is where most stops go wrong.
What’s trending up.
The violation codes moving fastest week over week. A spike can signal a regional blitz, a seasonal defect pattern, or simply where enforcement is leaning right now.
Two ways an English stop ends.
An English-language-proficiency check became an out-of-service offense in 2025 — but a citation only parks the truck about a third of the time. The split is all about how the driver was assessed: border-zone stops are written up and waved on, while failed interviews and sign tests almost always end the trip.
English-proficiency violations (49 CFR 391.11(b)(2)) over August 2026. The border-zone disposition is cited but rarely acted on; interview and sign-test failures are the ones that convert to out-of-service. States under 1,500 inspections are held back from the ranking. Most orders by raw volume: TX, CA, AR.
Quote a figure? Link the source.
These figures are free to cite and republish with attribution. Copy the reference line below, or drop a live, auto-updating stat straight onto your own page.
Trucking Comply — U.S. Roadside Truck Inspection Insights, week of Sep 4, 2026. www.truckingcomply.com/insights
The map is the country. What about your DOT number?
National trends are the backdrop. Your inspection history, your BASIC scores, and your renewal calendar are what actually move your insurance and your broker access. Trucking Comply tracks all of it in one place.
Source & disclaimer
Aggregated from public FMCSA MCMIS roadside-inspection data. Trucking Comply is not affiliated with or endorsed by FMCSA. Severity weights are a TC proxy of the SMS methodology, not official CSA scores.