Glossary. Updated 2026-10-30

What Is FMCSA (Federal Motor Carrier Safety Administration)?

Short answer: FMCSA, the Federal Motor Carrier Safety Administration, is the agency within the U.S. Department of Transportation that regulates the safety of commercial motor vehicles and motor carriers. It was established on January 1, 2000 and writes and enforces the Federal Motor Carrier Safety Regulations, including the inspection and maintenance rules in 49 CFR Part 396.

Definition

The Federal Motor Carrier Safety Administration is an operating administration of the U.S. Department of Transportation. It was created as a separate administration on January 1, 2000, under the Motor Carrier Safety Improvement Act of 1999. Its stated primary mission is to reduce crashes, injuries and fatalities involving large trucks and buses.

What FMCSA regulates

FMCSA writes the Federal Motor Carrier Safety Regulations in 49 CFR Parts 350 to 399. The parts repair shops meet most often are:

  • Part 390: general rules and definitions, such as commercial motor vehicle, motor carrier and gross vehicle weight rating.
  • Part 392: driving rules, including the driver's equipment check in 392.7.
  • Part 393: parts and accessories necessary for safe operation, such as brakes, lighting, tires and frames.
  • Part 396: inspection, repair and maintenance, including DVIRs, the annual inspection, and inspector qualifications.

FMCSA also runs compliance reviews and audits of carriers, and partners with state agencies that conduct roadside inspections.

Why it matters to repair shops

FMCSA rules bind motor carriers, but Part 396 says the carrier's agents and employees concerned with inspection or maintenance must also know and comply with it. A shop that performs annual inspections, certifies DVIR repairs or keeps maintenance records for a fleet is doing work FMCSA expects the carrier to be able to show in an audit. Clear, complete repair records help your customers pass those reviews.

Related

See 49 CFR 396, CVSA, and 49 CFR 396 explained for shops. The current text of every rule is on eCFR.

Questions

Is FMCSA the same as the DOT?

FMCSA is one agency within the U.S. Department of Transportation, focused on trucks, buses and motor carriers.

Does FMCSA regulate repair shops directly?

Its rules bind motor carriers, but Part 396 extends compliance duties to agents and employees involved in inspection and maintenance.

Sources

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