| Subtitle A—Office of the Secretary of Transportation |
| Part 1 - Organization and Delegation of Powers and Duties |
| Part 3 - Official Seal |
| Part 5 - Administrative Procedures |
| Part 6 - Implementation of Equal Access to Justice Act in Agency Proceedings |
| Part 7 - Public Availability of Information |
| Part 8 - Classified Information: Classification/Declassification/Access |
| Part 9 - Testimony of Employees of the Department and Production of Records in Legal Proceedings |
| Part 10 - Maintenance of and Access to Records Pertaining to Individuals |
| Part 11 - Protection of Human Subjects |
| Part 15 - Protection of Sensitive Security Information |
| Part 17 - Intergovernmental Review of Department of Transportation Programs and Activities |
| Part 18 - UNIFORM ADMINISTRATIVE REQUIREMENTS FOR GRANTS AND COOPERATIVE AGREEMENTS TO STATE AND LOCAL GOVERNMENTS |
| Part 19 - UNIFORM ADMINISTRATIVE REQUIREMENTS FOR GRANTS AND AGREEMENTS WITH INSTITUTIONS OF HIGHER EDUCATION, HOSPITALS, AND OTHER NON-PROFIT ORGANIZATIONS |
| Part 20 - New Restrictions on Lobbying |
| Part 21 - Nondiscrimination in Federally-Assisted Programs of the Department of Transportation - Effectuation of Title Vi of the Civil Rights Act of 1964 |
| Part 22 - Short-Term Lending Program (STLP) |
| Part 23 - Participation of Disadvantaged Business Enterprise in Airport Concessions |
| Part 24 - Uniform Relocation Assistance and Real Property Acquisition for Federal and Federally Assisted Programs |
| Part 25 - Nondiscrimination on the Basis of Sex in Education Programs or Activities Receiving Federal Financial Assistance |
| Part 26 - Participation by Disadvantaged Business Enterprises in Department of Transportation Financial Assistance Programs |
| Part 27 - Nondiscrimination on the Basis of Disability in Programs or Activities Receiving Federal Financial Assistance |
| Part 28 - Enforcement of Nondiscrimination on the Basis of Handicap in Programs or Activities Conducted by the Department of Transportation |
| Part 29 - Tribal Transportation Self-Governance Program |
| Part 30 - Denial of Public Works Contracts to Suppliers of Goods and Services of Countries That Deny Procurement Market Access to U.S. Contractors |
| Part 31 - Program Fraud Civil Remedies |
| Part 32 - Governmentwide Requirements for Drug-Free Workplace (Financial Assistance) |
| Part 33 - Transportation Priorities and Allocation System |
| Part 37 - Transportation Services for Individuals With Disabilities (Ada) |
| Part 38 - Americans With Disabilities Act (Ada) Accessibility Specifications for Transportation Vehicles |
| Part 39 - Transportation for Individuals With Disabilities: Passenger Vessels |
| Part 40 - Procedures for Transportation Workplace Drug and Alcohol Testing Programs |
| Part 41 - Seismic Safety |
| Part 71 - Standard Time Zone Boundaries |
| Part 79 - Medals of Honor |
| Part 80 - Credit Assistance for Surface Transportation Projects |
| Part 89 - Implementation of the Federal Claims Collection Act |
| Part 91 - International Air Transportation Fair Competitive Practices |
| Part 92 - Recovering Debts to the United States by Salary Offset |
| Part 93 - Aircraft Allocation |
| Part 95 - [Reserved] |
| Part 98 - Enforcement of Restrictions on Post-Employment Activities |
| Part 99 - Employee Responsibilities and Conduct |
| Parts 18--19 - [Reserved] |
| Subtitle B—Other Regulations Relating to Transportation |
| Chapter I—Pipeline and Hazardous Materials Safety Administration, Department of Transportation |
| Chapter II—Federal Railroad Administration, Department of Transportation |
| Chapter III—Federal Motor Carrier Safety Administration, Department of Transportation |
| Chapter IV - Coast Guard, Department of Homeland Security |
| Chapter V—National Highway Traffic Safety Administration, Department of Transportation |
| Chapter VI—Federal Transit Administration, Department of Transportation |
| Chapter VII - National Railroad Passenger Corporation (Amtrak) |
| Chapter VIII—National Transportation Safety Board |
| Chapter X—Surface Transportation Board |
| Chapter XI - Research and Innovative Technology Administration, Department of Transportation |
| Chapter XII—Transportation Security Administration, Department of Homeland Security |