Abbreviation: FMCSR

Federal Motor Carrier Safety Regulations

The body of federal regulations governing commercial motor vehicle safety, primarily found in Title 49 of the Code of Federal Regulations (49 CFR Parts 380–399).

Key parts for CDL compliance: Part 380 (ELDT), Part 382 (drug/alcohol), Part 383 (CDL standards), Part 391 (driver qualifications), Part 395 (hours of service).

Related: fmcsa , cdl

Last updated: June 4, 2026