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.]
(SCW 6.29.23)
Planning a road trip over the Fourth of July holiday?
— APStylebook (@APStylebook) June 28, 2023
AP style tells you how to style highway names, including: 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. pic.twitter.com/dS8M7TrCGR
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