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49 CFR Parts 300-399

The full set of Federal Motor Carrier Safety Regulations, and how to find the part you need.

The Full Set of Trucking Safety Rules

49 CFR Parts 300-399 is the common shorthand for the Federal Motor Carrier Safety Regulations (FMCSRs) — the complete body of federal rules FMCSA enforces, from driver qualification and hours of service to vehicle maintenance, hazardous materials, and drug & alcohol testing. Every topic on this site links back to a specific part within this range.

Finding a Specific Part

If you already know the part number you're after (for example, Part 395 for hours of service, or Part 396 for vehicle inspection), the fastest path is the eCFR index below rather than browsing this whole range section by section.

Free Resources

49 CFR Chapter III, Subchapter B — Federal Motor Carrier Safety Regulations eCFR
The complete, current index of every part within 49 CFR Parts 300-399 — browse to any specific part from here.
FMCSA Regulations and Interpretations FMCSA
FMCSA's own searchable hub for Parts 300-399, including official interpretations of specific sections.