<Li> Corridor W: From I - 85, in Greenville, South Carolina, to I - 26 / US 74, near East Flat Rock, North Carolina . Of the 39.7 - mile (63.9 km) section of US 25, only 30.4 - mile (48.9 km) was authorized for ADHS funding . In 2013, both states have completed Corridor W. US 25 in South Carolina provides a four - to - six - lane limited - access road, with interchanges at major intersections; while US 25 in North Carolina is a four - lane controlled - access highway . </Li> <P> US 25 was established on November 11, 1926 as part of the original United States Numbered Highway system; it was routed along the Dixie Highway, from North Augusta, South Carolina to Port Huron, Michigan, with a two divides (US 25E / US 25W) through Tennessee and Kentucky . In 1928, one divided section between Richmond and Newport, Kentucky was removed; US 25 followed the US 25W routing, while US 25E was replaced by mostly US 27 . In 1929, US 25 was extended south into Georgia, ending at US 80, near Statesboro, Georgia . In 1933, US 25 was extended north from Port Huron to Port Austin, Michigan . In 1936, US 25 was extended south again to its current terminus at US 17, in Brunswick, Georgia . </P> <P> In 1974, US 25 was eliminated in Ohio and Michigan, establishing its northern terminus on the Clay Wade Bailey Bridge, in Covington, Kentucky . Its former alignment was replaced by Interstate 75, between Cincinnati and Detroit, and Interstate 94 between Detroit and Port Huron . M - 25 continues as the designation of former US 25 between Port Huron and Port Austin . </P> <P> In 2000, US 25E was rerouted through the Cumberland Gap Tunnel (open four years prior), making a direct link between Tennessee and Kentucky, eliminating Virginia's short section . Its old alignment that went through historic Cumberland Gap was handed over to the Cumberland Gap National Historical Park, with the former roadbed through the park restored to an early 19th - century wagon path . </P>

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