DOT inspection levels I to VIII: what an officer checks at each
Who sets the levels
The Commercial Vehicle Safety Alliance (CVSA) publishes the North American Standard inspection procedures that state officers use. There are eight levels. The level tells you how deep the inspection goes.
Level I: the full inspection
The North American Standard Inspection. The officer checks the driver and the whole vehicle, including underneath.
- Driver: license, medical examiner's certificate and SPE certificate if you have one, alcohol and drugs, record of duty status and hours of service, seat belt
- Vehicle: inspection reports, brakes, cargo securement, coupling devices, driveline, exhaust, frame, fuel system, lights, steering, suspension, tires, van and open-top trailer bodies, wheels, rims and hubs, windshield wipers
- Passenger vehicles also get emergency exits, electrical systems and seating checked
- Hazmat and cargo tank items, checked only by certified inspectors
Levels II and III
Level II, walk-around driver/vehicle inspection: the same items as Level I, but only what can be checked without getting under the truck.
Level III, driver/credential/administrative inspection: no mechanical check. The officer looks at the driver's credentials, hours of service, and carrier identification and status. This is where your paperwork and how your truck is identified get the most attention.
Levels IV to VIII
- Level IV, special inspection: usually a one-time check of one particular item
- Level V, vehicle-only: the Level I vehicle items with no driver present, done anywhere
- Level VI: for select radioactive shipments (transuranic waste and highway route controlled quantities)
- Level VII, jurisdictional mandated: state programs like school bus, taxi or limo inspections; no CVSA decal is issued
- Level VIII, electronic: done wirelessly while the truck is moving, with no officer interaction, checking data like driver licensing, hours of service and registration
Truck markings can be cited
Your door lettering is part of the inspection. On one Level I inspection in FMCSA's public data from June 2025, the officer cited 390.21T(c): required markings not legible from 50 feet while stationary because of improper size, location or color. That violation wasn't out of service and wasn't used in the carrier's SMS score, but it went on the inspection report, next to an IRP registration violation and several hours of service items.
The rule itself: under 49 CFR 390.21 your legal name or single trade name and "USDOT" plus your number go on both sides of the power unit, in letters that contrast sharply with the background and read from 50 feet in daylight. See USDOT number size requirements for what that means in inches, or order USDOT truck lettering that's sized for it.
Related questions
What is a Level I DOT inspection?
The full North American Standard Inspection: the driver's credentials and hours plus the whole vehicle, including underneath.
Can I get a ticket for my DOT number being too small?
Markings that aren't legible from 50 feet because of size, location or color can be cited under 390.21. What happens after that depends on the officer and the state.
Does a Level III inspection look at the truck at all?
Not mechanically. Level III covers driver credentials, hours of service, and carrier identification and status.
What is a Level VIII inspection?
An electronic inspection done wirelessly while the vehicle is moving, without an officer stopping you, that checks things like licensing, hours of service and registration.
Checked against the current regulations September 2026. This is a plain-English summary, not legal advice. When your situation is unusual, ask the CHP, FMCSA or CSLB directly.