United States Numbered Highway System in the context of "U.S. Route 1"

Road → Highway → Contiguous United States → State governments of the United States → Local government in the United States → American Association of State Highway and Transportation Officials → United States Department of Transportation → U.S. Route 421 → U.S. Route 21 → List of divided U.S. Routes → U.S. Route 19E → U.S. Route 19W → U.S. Route 25E → U.S. Route 25W → U.S. Route 74 → Special routes of U.S. Route 74 →