AP Style Highway Designations

Use these forms, as appropriate in the context, for highways identified by number. For example,

  • 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. For example,

  • Route 1A

See also AP Style Addresses and AP Style Numbers.

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