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U.S. Code of Federal Regula...
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Title 23—Highways
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CHAPTER I—FEDERAL HIGHWAY A...
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PART 470—HIGHWAY SYSTEMS
PART 470—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.