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FEDERAL · CFR

Title 23 — Highways

65 parts. Last amended March 5, 2026. View on eCFR ↗

Part 1GeneralPart 140ReimbursementPart 172Procurement, Management, and Administration of Engineering and Design Related ServicesPart 180Credit Assistance for Surface Transportation ProjectsPart 190Incentive Payments for Controlling Outdoor Advertising on the Interstate SystemPart 192Drug Offender's Driver's License SuspensionPart 200Title VI Program and Related Statutes—Implementation and Review ProceduresPart 230External ProgramsPart 260Education and Training ProgramsPart 420Planning and Research Program AdministrationPart 450Planning Assistance and StandardsPart 460Public Road Mileage for Apportionment of Highway Safety FundsPart 470Highway SystemsPart 490National Performance Management MeasuresPart 511Real-Time System Management Information ProgramPart 515Asset Management PlansPart 620EngineeringPart 624Interstate System AccessPart 625Design Standards for HighwaysPart 626Pavement PolicyPart 627Value EngineeringPart 630Preconstruction ProceduresPart 633Required Contract ProvisionsPart 635Construction and MaintenancePart 636Design-Build ContractingPart 637Construction Inspection and ApprovalPart 645UtilitiesPart 646RailroadsPart 650Bridges, Structures, and HydraulicsPart 655Traffic OperationsPart 656Carpool and Vanpool ProjectsPart 657Certification of Size and Weight EnforcementPart 658Truck Size and Weight, Route Designations—Length, Width and Weight LimitationsPart 660Special Programs (Direct Federal)Part 661Tribal Transportation Facility Bridge Program (TTFBP)Part 667Periodic Evaluation of Facilities Repeatedly Requiring Repair and Reconstruction Due to Emergency EventsPart 668Emergency Relief ProgramPart 669Enforcement of Heavy Vehicle Use TaxPart 680National Electric Vehicle Infrastructure Standards and RequirementsPart 710Right-of-Way and Real EstatePart 750Highway BeautificationPart 751Junkyard Control and AcquisitionPart 752Landscape and Roadside DevelopmentPart 771Environmental Impact and Related ProceduresPart 772Procedures for Abatement of Highway Traffic Noise and Construction NoisePart 773Surface Transportation Project Delivery Program Application Requirements and TerminationPart 774Parks, Recreation Areas, Wildlife and Waterfowl Refuges, and Historic Sites (Section 4(f))Part 777Mitigation of Impacts to Wetlands and Natural HabitatPart 778Pilot Program for Eliminating Duplication of Environmental ReviewsPart 810Mass Transit and Special Use Highway ProjectsPart 924Highway Safety Improvement ProgramPart 940Intelligent Transportation System Architecture and StandardsPart 950Electronic Toll CollectionPart 1200Uniform Procedures for State Highway Safety Grant ProgramsPart 1208National Minimum Drinking AgePart 1210Operation of Motor Vehicles by Intoxicated MinorsPart 1215Use of Safety Belts—Compliance and Transfer-of-Funds ProceduresPart 1225Operation of Motor Vehicles by Intoxicated PersonsPart 1235Uniform System for Parking for Persons with DisabilitiesPart 1240Safety Incentive Grants for Use of Seat Belts—Allocations Based on Seat Belt Use RatesPart 1270Open Container LawsPart 1275Repeat Intoxicated Driver LawsPart 1300Uniform Procedures for State Highway Safety Grant ProgramsPart 1327Procedures for Participating in and Receiving Information from the National Driver Register Problem Driver Pointer SystemPart 1340Uniform Criteria for State Observational Surveys of Seat Belt Use