AP STYLE: Highways

highway designations

Use these forms, as appropriate in the context, for highways identified by number: U.S. Highway 1, U.S. Route 1, U.S. 1, state Route 34, Route 34, Interstate Highway 495, Interstate 495. On second reference only for Interstate: I-495.

When a letter is appended to a number, capitalize it but do not use a hyphen: Route 1A.

[See addresses and numerals.]

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