The concurrency then has a full interchange with Interstate 40 (I-40; exits 432A–B) before US 411/SR 35 separate and turn south while US 25W/US 70/SR 9 leave Newport and cross into Jefferson County.The highway next intersects US 441/SR 71 (which provides access to Norris Lake and Dam) before coming to an interchange where US 25W/SR 9 becomes concurrent with I-75 (exit 129) leaving SR 116 to trace the historical route of US 25W/SR 9.Upon entry into Whitley County, US 25W runs parallel with and closely follow I-75 for the rest of its course, including the points where it traverses the towns of Williamsburg and Corbin.It continues to parallel Clear Fork as the highway travels down a narrow valley, passing through the communities of Red Ash, Saxton, Pleasant View, and Emlyn.The highway follows the east bank of the river, passes the entrance to downtown and continues north through the Highland Park neighborhood before leaving Williamsburg and intersecting KY 26 near Wofford.[6] At sometime in the 1940s, US 25W was rerouted to its current alignment to provide easier access to Cumberland Falls, and KY 26 ran US 25W's original course between Corbin and Williamsburg.