In California, every commercial vehicle must comply with mandatory inspections to ensure safety and proper operation on the road. Two of the most important inspections are the federal DOT (Department of Transportation) inspection and California´s BIT (Biennial Inspection of Terminals), enforced by the California Highway Patrol (CHP).

Many drivers see these inspections as just another formality—but being unprepared can result in fines, vehicle impoundment, or even suspension of operations.

What Is the DOT Inspection?

The DOT inspection is a federal requirement under the authority of the Federal Motor Carrier Safety Administration (FMCSA). It applies to commercial vehicles with a gross vehicle weight over 10,001 pounds, those transporting hazardous materials, or passenger vehicles.

This inspection is governed by 49 CFR Part 396, which outlines requirements for systematic vehicle maintenance, annual inspections, and daily pre-trip checks.

During a stop or roadside inspection, officers evaluate:

• Brakes, tires, lights, suspension, and steering systems.


• Electronic Logging Device (ELD) records.


• Valid CDL license, insurance, and medical examiner´s certificate.

DOT inspections may occur at roadside checks or during national events such as the annual International Roadcheck in May.

What About the BIT Inspection?

California´s BIT program is governed by Section 34501.12 of the California Vehicle Code. It requires commercial vehicle operators to undergo periodic inspections of their terminals—where vehicles are stored and maintained.

CHP inspectors may review:

• Preventive maintenance documentation.


• Daily inspection logs completed by drivers.


• Mechanical condition of trucks and trailers.


• Safety standards at the terminal or parking area.

Although officially required every two years, CHP may conduct unannounced inspections at any time.

Why Compliance Matters

Beyond avoiding fines or downtime, compliance saves lives. A faulty brake system or worn steering components can result in fatal accidents.

Don´t wait until inspection day. Keep your records updated, stick to a regular maintenance plan, and train your crew. Compliance isn´t optional—it´s your duty as a professional operator.

Are Your Papers in Order? The Road Demands It.