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Title 23

Displaying title 23, up to date as of 6/10/2026. Title 23 was last amended 6/10/2026.
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Title 23HighwaysPart / Section
Chapter IFederal Highway Administration, Department of Transportation1 – 999
Subchapter EPlanning and Research420 – 490
Part 420Planning and Research Program Administration420.101 – 420.209
Subpart AAdministration of FHWA Planning and Research Funds420.101 – 420.121
Subpart BResearch, Development and Technology Transfer Program Management420.201 – 420.209
Part 450Planning Assistance and Standards450.100 – 450.340
Subpart ATransportation Planning and Programming Definitions450.100 – 450.104
Subpart BStatewide and Nonmetropolitan Transportation Planning and Programming450.200 – 450.226
Subpart CMetropolitan Transportation Planning and Programming450.300 – 450.340
Appendix A to Part 450
Linking the Transportation Planning and NEPA Processes
Part 460Public Road Mileage for Apportionment of Highway Safety Funds460.1 – 460.3
§ 460.1Purpose.
§ 460.2Definitions.
§ 460.3Procedures.
Part 470Highway Systems470.101 – 470.115
Subpart AFederal-aid Highway Systems470.101 – 470.115
Subparts B-C [Reserved]
Part 490National Performance Management Measures490.101 – 490.811
Subpart AGeneral Information490.101 – 490.111
Subpart BNational Performance Management Measures for the Highway Safety Improvement Program490.201 – 490.213
Subpart CNational Performance Management Measures for the Assessing Pavement Condition490.301 – 490.319
Subpart DNational Performance Management Measures for Assessing Bridge Condition490.401 – 490.413
Subpart ENational Performance Management Measures To Assess Performance of the National Highway System490.501 – 490.515
Subpart FNational Performance Management Measures To Assess Freight Movement on the Interstate System490.601 – 490.613
Subpart GNational Performance Management Measure for Assessing the Congestion Mitigation and Air Quality Improvement Program—Traffic Congestion490.701 – 490.713
Subpart HNational Performance Management Measures to Assess the Congestion Mitigation and Air Quality Improvement Program—On-Road Mobile Source Emissions490.801 – 490.811