A roadside inspection can end your day fast — or barely slow you down. The difference usually comes down to preparation. Here are the five areas inspectors focus on most, based on recent CVSA and FMCSA inspection data.
1. Brakes Brake violations have been the number one cause of out-of-service orders for over a decade. Inspectors listen for air leaks, check brake adjustment and pushrod travel, and look for worn linings or missing components. Brakes, tires, and lights together account for over 75% of all out-of-service vehicle orders. A real pre-trip catches every one of these before an inspector does.
2. Tires Inspectors check tread depth — anything under 2/32 of an inch is a violation — along with flats, audible air leaks, and uneven wear. Tires degrade slowly and incrementally, which is exactly why they get missed. Walk your tires every single day.
3. Lights Lighting makes up over 28% of all roadside inspection violations. Inspectors check that every required lamp works, shows the correct color, and is clean and properly mounted — headlights, markers, turn signals, brake lamps, and reflective tape. A burned-out bulb is a five-minute fix at the parts counter and a violation on the roadside.
4. Hours of Service and Your Logs Hours-of-service violations are the number one driver-side issue, accounting for roughly a third of all driver violations. Inspectors look closely at your record of duty status — and increasingly at ELD data for suspicious edits near your HOS limits. Keep your logs current and accurate, and make sure your hours are certified. An honest, up-to-date log is your strongest defense.
Important: When an inspection is underway, log your status as On Duty (Not Driving) for the duration of the inspection. The time you spend with an inspector is on-duty time and your log must reflect it accurately. Never let an inspection go unlogged — a clean, honest record is what protects you.
5. Your Documents Inspectors check for a valid CDL, a current medical certificate, and proper vehicle paperwork including registration and the periodic inspection certificate. Missing or expired documents are completely preventable — they only slip through when nobody is tracking expiration dates. Know your dates before they become a problem.
The pattern across nearly every violation is the same: these aren't surprise failures, they're missed checks. A thorough pre-trip and an honest, current log will carry you through almost any inspection. You can never be too careful out there.
Stay road-ready. The CabPrep Safety collection has the gear that keeps you compliant and prepared mile after mile.