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U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

FMCSA Regulations and Interpretations – 49 CFR Parts 300-399

For a searchable, indexed database that contains and links to all guidance documents in effect from the Federal Motor Carrier Safety Administration, please visit FMCSA’s Guidance Portal. To view the latest eCFR version of FMCSA’s Regulations in 49 CFR Parts 300-399, click the link in the first column. To search and browse regulations using the eCFR website, use the link below.

Search the eCFR

Part 40

Procedures for Transportation Workplace Drug and Alcohol Testing Programs

Parts 300-302


Part 303

Civil Rights

Part 325

Compliance with Interstate Motor Carrier Noise Emission Standards

Part 350

Motor Carrier Safety Assistance Program (MCSAP) and High Priority Program

Part 355


Part 356

Motor Carrier Routing Regulations

Part 360

Fees for Motor Carrier Registration and Insurance

Part 365

Rules Governing Applications for Operating Authority

Part 366

Designation of Process Agent

Part 367

Standards for Registration with States

Part 368

Application for a Certificate of Registration to Operate in Municipalities in the United States on the United States-Mexico International Border or Within the Commercial Zones of Such Municipalities.

Part 369

Reports of Motor Carriers

Part 370

Principles and Practices for the Investigation and Voluntary Disposition of Loss and Damage Claims and Processing Salvage

Part 371

Brokers of Property

Part 372

Exemptions, Commercial Zones, and Terminal Areas

Part 373

Receipts and Bills

Part 374

Passenger Carrier Regulations

Part 375

Transportation of Household Goods in Interstate Commerce; Consumer Protection Regulations

Part 376

Lease and Interchange of Vehicles

Part 377

Payment of Transportation Charges

Part 378

Procedures Governing the Processing, Investigation, and Disposition of Overcharge, Duplicate Payment, or Overcollection Claims

Part 379

Preservation of Records

Part 380

Special Training Requirements

Part 381

Waivers, Exemptions, and Pilot Programs

Part 382

Controlled Substances and Alcohol Use and Testing

Part 383

Commercial Driver's License Standards; Requirements and Penalties

Part 384

State Compliance with Commercial Driver's License Program

Part 385

Safety Fitness Procedures

Part 386

Rules of Practice for FMCSA Proceedings

Part 387

Minimum Levels of Financial Responsibility for Motor Carriers

Part 388


Part 389

Rulemaking Procedures Federal Motor Carrier Safety Regulations

Part 390

Federal Motor Carrier Safety Regulations; General

Part 391

Qualifications of Drivers and Longer Combination Vehicle (LCV) Driver Instructors

Part 392

Driving of Commercial Motor Vehicles

Part 393

Parts and Accessories Necessary for Safe Operation

Part 394


Part 395

Hours of Service of Drivers

Part 396

Inspection, Repair, and Maintenance

Part 397

Transportation of Hazardous Materials; Driving and Parking Rules

Part 398

Transportation of Migrant Workers

Part 399

Employee Safety and Health Standards