U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

All TitlesTitle 23Chapter IPart 470Subpart A - Subpart A—Federal-aid Highway Systems
§ 470.101 - Purpose.
§ 470.103 - Definitions.
§ 470.105 - Urban area boundaries and highway functional classification.
§ 470.107 - Federal-aid highway systems.
§ 470.109 - System procedures—General.
§ 470.111 - Interstate System procedures.
§ 470.113 - National Highway System procedures.
§ 470.115 - Approval authority.
Appendix Appendix A - Appendix A to Subpart A of Part 470—Guidance Criteria for Evaluating Requests for Interstate System Designations under 23 U.S.C. 103(c)(4)(A) and (B)
Appendix Appendix B - Appendix B to Subpart A of Part 470—Designation of Segments of Section 332(a)(2) Corridors as Parts of the Interstate System
Appendix Appendix C - Appendix C to Subpart A of Part 470—Policy for the Signing and Numbering of Future Interstate Corridors Designated by Section 332 of the NHS Designation Act of 1995 or Designated Under 23 U.S.C. 103(c)(4)(B)
Appendix Appendix D - Appendix D to Subpart A of Part 470—Guidance Criteria for Evaluating Requests for Modifications to the National Highway System
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