 At the bottom of the descent, US 460 and US 11 expand to a four-lane divided highway and parallel the Christiansburg District rail line and Spring Branch to the stream's confluence with the South Fork of the Roanoke River at Shawsville.The U.S.Highways follow the rail line and South Fork through Elliston to its confluence with the North Fork to form the Roanoke River proper at Lafayette, just east of which the road enters Roanoke County.