Title 23 — Highways
- Part 1— General
- Part 140— Reimbursement
- Part 172— Procurement, Management, and Administration of Engineering and Design Related Services
- Part 180— Credit Assistance for Surface Transportation Projects
- Part 190— Incentive Payments for Controlling Outdoor Advertising on the Interstate System
- Part 192— Drug Offender's Driver's License Suspension
- Part 200— Title VI Program and Related Statutes—Implementation and Review Procedures
- Part 230— External Programs
- Part 260— Education and Training Programs
- Part 420— Planning and Research Program Administration
- Part 450— Planning Assistance and Standards
- Part 460— Public Road Mileage for Apportionment of Highway Safety Funds
- Part 470— Highway Systems
- Part 490— National Performance Management Measures
- Part 511— Real-Time System Management Information Program
- Part 515— Asset Management Plans
- Part 620— Engineering
- Part 624— Interstate System Access
- Part 625— Design Standards for Highways
- Part 626— Pavement Policy
- Part 627— Value Engineering
- Part 630— Preconstruction Procedures
- Part 635— Construction and Maintenance
- Part 636— Design-Build Contracting
- Part 637— Construction Inspection and Approval
- Part 645— Utilities
- Part 646— Railroads
- Part 650— Bridges, Structures, and Hydraulics
- Part 655— Traffic Operations
- Part 656— Carpool and Vanpool Projects
- Part 657— Certification of Size and Weight Enforcement
- Part 658— Truck Size and Weight, Route Designations—Length, Width and Weight Limitations
- Part 660— Special Programs (Direct Federal)
- Part 661— Tribal Transportation Facility Bridge Program (TTFBP)
- Part 667— Periodic Evaluation of Facilities Repeatedly Requiring Repair and Reconstruction Due to Emergency Events
- Part 668— Emergency Relief Program
- Part 669— Enforcement of Heavy Vehicle Use Tax
- Part 680— National Electric Vehicle Infrastructure Standards and Requirements
- Part 710— Right-of-Way and Real Estate
- Part 750— Highway Beautification
- Part 751— Junkyard Control and Acquisition
- Part 752— Landscape and Roadside Development
- Part 771— Environmental Impact and Related Procedures
- Part 772— Procedures for Abatement of Highway Traffic Noise and Construction Noise
- Part 773— Surface Transportation Project Delivery Program Application Requirements and Termination
- Part 774— Parks, Recreation Areas, Wildlife and Waterfowl Refuges, and Historic Sites (Section 4(f))
- Part 777— Mitigation of Impacts to Wetlands and Natural Habitat
- Part 778— Pilot Program for Eliminating Duplication of Environmental Reviews
- Part 810— Mass Transit and Special Use Highway Projects
- Part 924— Highway Safety Improvement Program
- Part 940— Intelligent Transportation System Architecture and Standards
- Part 950— Electronic Toll Collection
- Part 1200— Uniform Procedures for State Highway Safety Grant Programs
- Part 1208— National Minimum Drinking Age
- Part 1210— Operation of Motor Vehicles by Intoxicated Minors
- Part 1215— Use of Safety Belts—Compliance and Transfer-of-Funds Procedures
- Part 1225— Operation of Motor Vehicles by Intoxicated Persons
- Part 1235— Uniform System for Parking for Persons with Disabilities
- Part 1240— Safety Incentive Grants for Use of Seat Belts—Allocations Based on Seat Belt Use Rates
- Part 1270— Open Container Laws
- Part 1275— Repeat Intoxicated Driver Laws
- Part 1300— Uniform Procedures for State Highway Safety Grant Programs
- Part 1327— Procedures for Participating in and Receiving Information from the National Driver Register Problem Driver Pointer System
- Part 1340— Uniform Criteria for State Observational Surveys of Seat Belt Use