DOT North American Standard (NAS) Inspection Levels I–VI

Question 1

A DOT inspector stops a commercial motor vehicle and conducts a full examination of both the driver's documents and the vehicle's mechanical components, including a complete underbody inspection. Which NAS inspection level has been performed?

Accepted Answer

Level I – North American Standard Inspection

Answer

Level I is the most comprehensive roadside inspection, covering both the driver (credentials, hours of service, medical certificate) and a full mechanical inspection of the vehicle including an underbody examination. It is the standard against which all other levels are measured.

Question 2

An inspector at a fixed facility inspects a vehicle that has no driver present — the driver has departed. Which NAS inspection level is most appropriate?

Accepted Answer

Level V – Vehicle-Only Inspection

Answer

Level V is the vehicle-only inspection, conducted when no driver is present. It covers the same vehicle components as a Level I inspection but omits the driver examination because the driver is unavailable.

Question 3

During a Level III inspection, an inspector reviews the driver's commercial driver's license, medical examiner's certificate, and hours-of-service records. The inspector does NOT examine which of the following?

Accepted Answer

Brake adjustment on all axles

Answer

Level III is a driver/credential/administrative inspection only. It does not include any physical examination of the vehicle's mechanical components, such as brake adjustment. Brake checks are part of Level I and Level II inspections.

Question 4

Which NAS inspection level is specifically designed for targeted enforcement of a single regulatory area, such as verifying that cargo securement devices are properly applied across an entire fleet at a terminal?

Accepted Answer

Level IV – Special Inspections

Answer

Level IV covers special inspections, which are directed at a single element of compliance — such as a focused cargo securement audit, a lights-only check, or a targeted enforcement campaign. These inspections are not random; they are pre-planned to address a specific regulatory element.

Question 5

A Level II walk-around inspection differs from a Level I inspection primarily because the inspector:

Accepted Answer

Examines only the exterior of the vehicle without going under it

Answer

The defining difference of a Level II inspection is that the inspector does not go beneath the vehicle. All accessible components are examined from the outside (walk-around), but items requiring an underbody examination are excluded. Driver documents are still reviewed in Level II.

DOT Inspector Certification Practice Test

DOT Inspector Certification Practice Test

DOT North American Standard (NAS) Inspection Levels I–VI