Highway

Highway means:
(1) A road, street, or parkway and all associated elements such as a right-of-way, bridge, railway-highway crossing, tunnel, drainage structure, sign, markings, guardrail, protective structure, etc.;
(2) A roadway facility as may be required by the United States Customs and Immigration Services in connection with the operation of an international bridge or tunnel; and
(3) A facility that serves pedestrians and bicyclists pursuant to 23 U.S.C. 148(e)(1)(A).

Source

23 CFR § 924.3

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Scoping language

Unless otherwise specified in this part, the definitions in 23 U.S.C. 101 are applicable to this part. In addition, the following definitions apply:

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