USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

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

Title 23 - Code of Federal Regulations (and Non-regulatory Supplements)

Table of Contents

CHAPTER I - FEDERAL HIGHWAY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION

SUBCHAPTER A - GENERAL MANAGEMENT AND ADMINISTRATION

1 General

SUBCHAPTER B - PAYMENT PROCEDURES

140 Reimbursement
       Non-regulatory Supplement for Part 140, Subpart B
       Non-regulatory Supplement for Part 140, Subpart I
172 Administration of Engineering and Design Related Service Contracts
180 Credit Assistance for Surface Transportation Projects
190 Incentive Payments for Controlling Outdoor Advertising On The Interstate System
192 Drug Offender's Driver's License Suspension

SUBCHAPTER C - CIVIL RIGHTS

200 Title VI Program and Related StatutesImplementation and Review Procedures
       Non-regulatory Supplement for Part 200
230 External Programs
       Non-regulatory Supplement for Part 230, Subpart A
       Non-regulatory Supplement for Part 230, Subpart B
       Non-regulatory Supplement for Part 230, Subpart C
       Non-regulatory Supplement for Part 230, Subpart D

SUBCHAPTER D - NATIONAL HIGHWAY INSTITUTE

260 Education and Training Programs
       Non-regulatory Supplement for Part 260, Subpart D

SUBCHAPTER E - PLANNING AND RESEARCH

420 Planning and Research Program Administration
450 Planning Assistance and Standards
460 Public Road Mileage for Apportionment of Highway Safety Funds
470 Highway Systems

SUBCHAPTER F - TRANSPORTATION INFRASTRUCTURE MANAGEMENT

500 Management and Monitoring Systems
505 Projects of National and Regional Significance Evaluation and Rating
511 Real-Time System Management Information Program

SUBCHAPTER G - ENGINEERING AND TRAFFIC OPERATIONS

620 Engineering
       Non-regulatory Supplement for Part 620, Subpart A
625 Design Standards for Highways
       Non-regulatory Supplement for Part 625
       Interstate System Access
626 Pavement Policy
       Non-regulatory Supplement for Part 626
627 Value Engineering
630 Preconstruction Procedures
       Non-regulatory Supplement for Part 630, Subpart A
       Non-regulatory Supplement for Part 630, Subpart B
       Non-regulatory Supplement for Part 630, Subpart D
       Non-regulatory Supplement for Part 630, Subpart H
633 Required Contract Provisions
       Non-regulatory Supplement for Part 633, Subpart A
       Non-regulatory Supplement for Part 633, Subpart B
       Non-regulatory Supplement 1 for Part 633, Subpart B
       Non-regulatory Supplement 2 for Part 633, Subpart B
       Non-regulatory Supplement 3 for Part 633, Subpart B
       Non-regulatory Supplement 4 for Part 633, Subpart B
       Non-regulatory Supplement 5 for Part 633, Subpart B
635 Construction and Maintenance
       Non-regulatory Supplement for Part 635
       Non-regulatory Supplement for Part 635, Subpart A
       Non-regulatory Supplement for Part 635, Subpart B
       Non-regulatory Supplement for Part 635, Subpart C
       Non-regulatory Supplement for Part 635, Subpart D
636 Design-build Contracting
637 Construction Inspection and Approval
       Non-regulatory Supplement for Part 637, Subpart B
645 Utilities
       Non-regulatory Supplement 1 for Part 645, Subpart A
       Non-regulatory Supplement 2 for Part 645, Subpart A
646 Railroads
       Non-regulatory Supplement for Part 646, Subpart A
       Non-regulatory Supplement 1 for Part 646, Subpart B
       Non-regulatory Supplement 2 for Part 646, Subpart B
       Non-regulatory Supplement 3 for Part 646, Subpart B
       Non-regulatory Supplement 4 for Part 646, Subpart B
       Non-regulatory Supplement 5 for Part 646, Subpart B
650 Bridges, Structures, and Hydraulics
       Non-regulatory Supplement 1 for Part 650, Subpart A
       Non-regulatory Supplement 2 for Part 650, Subpart A
       Non-regulatory Supplement 3 for Part 650, Subpart A
       Non-regulatory Supplement 1 for Part 650, Subpart B
       Non-regulatory Supplement 2 for Part 650, Subpart B
       Non-regulatory Supplement 3 for Part 650, Subpart B
       Non-regulatory Supplement for Part 650, Subpart C
       Non-regulatory Supplement for Part 650, Subpart D
       Non-regulatory Supplement for Part 650, Subpart G
       Non-regulatory Supplement for Part 650, Subpart H
652 Pedestrian and Bicycle Accommodations and Projects
655 Traffic Operations
656 Carpool and Vanpool Projects
       Non-regulatory Supplement for Part 656
657 Certification of Size and Weight Enforcement
658 Truck Size and Weight, Route DesignationsLength, Width and Weight Limitations
       Non-regulatory Supplement for Part 658
660 Special Programs (Direct Federal)
       Non-regulatory Supplement for Part 660, Subpart A
       Non-regulatory Supplement 1 for Part 660, Subpart E
       Non-regulatory Supplement 2 for Part 660, Subpart E
       Non-regulatory Supplement 3 for Part 660, Subpart E
       Non-regulatory Supplement 4 for Part 660, Subpart E
       Non-regulatory Supplement 5 for Part 660, Subpart E
661 Indian Reservation Road Bridge Program
667 [Reserved]
668 Emergency Relief Program
669 Enforcement of Heavy Vehicle Use Tax

SUBCHAPTER H - RIGHT-OF-WAY AND ENVIRONMENT

710 Right-of-way and Real Estate
750 Highway Beautification
       Non-regulatory Supplement for Part 750, Subpart B
       Non-regulatory Supplement 1 for Part 750, Subpart D
       Non-regulatory Supplement 2 for Part 750, Subpart D
       Non-regulatory Supplement 1 for Part 750, Subpart G
       Non-regulatory Supplement 2 for Part 750, Subpart G
751 Junkyard Control and Acquisition
       Non-regulatory Supplement 1 for Part 751
       Non-regulatory Supplement 2 for Part 751
752 Landscape and Roadside Development
       Non-regulatory Supplement for Part 752
771 Environmental Impact and Related Procedures
772 Procedures for Abatement of Highway Traffic Noise and Construction Noise
773 Surface Transportation Project Delivery Pilot Program
774 Parks, Recreation Areas, Wildlife and Waterfowl Refuges, and Historic Sites (Section 4(F))
777 Mitigation of Impacts To Wetlands and Natural Habitat

SUBCHAPTER I - PUBLIC TRANSPORTATION

810 Mass Transit and Special Use Highway Projects

SUBCHAPTER J - HIGHWAY SAFETY

924 Highway Safety Improvement Program
       Non-regulatory Supplement for Part 924

SUBCHAPTER K - INTELLIGENT TRANSPORTATION SYSTEMS

940 Intelligent Transportation System Architecture and Standards
950 Electronic Toll Collection

SUBCHAPTER L - FEDERAL LANDS HIGHWAYS

970 National Park Service Management Systems
971 Forest Service Management Systems
972 Fish and Wildlife Service Management Systems
973 Management Systems Pertaining to the Bureau of Indian Affairs and the Indian Reservation Roads Program

CHAPTER II - NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION AND FEDERAL HIGHWAY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION

SUBCHAPTER A - PROCEDURES FOR STATE HIGHWAY SAFETY PROGRAMS

1200 Uniform Procedures for State Highway Safety Programs

SUBCHAPTER B - GUIDELINES

1204-1206 [Reserved]
1208 National Minimum Drinking Age
1210 Operation of Motor Vehicles By Intoxicated Minors
1215 Use of Safety BeltsCompliance and Transfer-of-funds Procedures
1225 Operation of Motor Vehicles By Intoxicated Persons
1235 Uniform System for Parking for Persons With Disabilities
1240 Safety Incentive Grants for Use of Seat BeltsAllocations Based On Seat Belt Use Rates

SUBCHAPTER C - GENERAL PROVISIONS

1250-1252 [Reserved]

SUBCHAPTER D - TRANSFER AND SANCTION PROGRAMS

1270 Open Container Laws
1275 Repeat Intoxicated Driver Laws
Last updated: Monday, December 9, 2024