Title 49 of the US Code of Federal Regulations (49 CFR) contains all US regulations dealing with Transportation in the United States. The Title is organized into nine volumes, and the regulations it contains are authored by various components of the Departments of Transportation and Homeland Security. Most notably, 49 CFR contains the US Hazardous Material Regulations (HMR) in Parts 100-177.

This sixth volume contains transportation regulations authored by the United States Coast Guard in chapter four, and regulations authored by the National Highway Traffic Safety Administration in chapter five:

Chapter IV—Coast Guard, Department of Homeland Security

• Subchapter A—[Reserved]
• Subchapter B—Safety Approval of Cargo Containers
• Part 400-449 - [Reserved]
• Part 450 - General
• Part 451 - Testing and Approval of Containers
• Part 452 - Examination of Containers
• Part 453 - Control and Enforcement

Chapter V—National Highway Traffic Safety Administration, Department of Transportation

• Part 501 - Organization and Delegation of Powers and Duties
• Part 509 - OMB Control Numbers for Information Collection Requirements
• Part 510 - Information Gathering Powers
• Part 511 - Adjudicative Procedures
• Part 512 - Confidential Business Information
• Part 520 - Procedures for Considering Environmental Impacts
• Part 523 - Vehicle Classification
• Part 525 - Exemptions from Average Fuel Economy Standards
• Part 526 - Petitions and Plans for Relief Under the Automobile Fuel Efficiency Act of 1980
• Part 529 - Manufacturers of Multistage Automobiles
• Part 531 - Passenger Automobile Average Fuel Economy Standards
• Part 533 - light Truck Fuel Economy Standards
• Part 534 - Rights and Responsibilities of Manufacturers in the Context of Changes in Corporate Relationships
• Part 535 - Medium- and Heavy-Duty Vehicle Fuel Efficiency Program
• Part 536 - Transfer and Trading of Fuel Economy Credits
• Part 537 - Automotive Fuel Economy Reports
• Part 538 - Manufacturing Incentives for Alternative Fuel Vehicles
• Part 541 - Federal Motor Vehicle Theft Prevention Standard
• Part 542 - Procedures for Selecting light Duty Truck lines to Be Covered by the Theft Prevention Standard
• Part 543 - Exemption from Vehicle Theft Prevention Standard
• Part 544 - Insurer Reporting Requirements
• Part 545 - Federal Motor Vehicle Theft Prevention Standard Phase-In and Small-Volume line Reporting Requirements
• Part 551 - Procedural Rules
• Part 552 - Petitions for Rulemaking, Defect, and Noncompliance Orders
• Part 553 - Rulemaking Procedures
• Part 554 - Standards Enforcement and Defects Investigation
• Part 555 - Temporary Exemption from Motor Vehicle Safety and Bumper Standards
• Part 556 - Exemption for Inconsequential Defect or Noncompliance
• Part 557 - Petitions for Hearings on Notification and Remedy of Defects
• Part 563 - Event Data Recorders
• Part 564 - Replaceable light Source Information (effective until December 1, 2012)
• Part 565 - Vehicle Identification Number (Vin) Requirements
• Part 566 - Manufacturer Identification
• Part 567 - Certification
• Part 568 - Vehicles Manufactured in Two or More Stages: All Incomplete, Intermediate and Final-Stage Manufacturers of Vehicles Manufactured in Two or More Stages
• Part 569 - Regrooved Tires
• Part 570 - Vehicle in Use Inspection Standards
• Part 571 - Federal Motor Vehicle Safety Standards