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U.S. Route 17-1 was a designated highway in North Carolina and Virginia from 1926 to 1933, and may have been the only hyphenated route designation in the U.S. Highway system. According to some sources, the route may or may not have been signed as "17-1" in the field, though it was included on several contemporary maps of the then-new highway system. It met its parent, U.S. Route 17, in Wilmington, North Carolina.

U.S. Highway 171 is a north–south United States highway. This short-route 179-mile highway, entirely within western Louisiana, has remained largely unchanged from its original 1926 route.