While officially labelled as a north-south highway, it runs northeast-southwest diagonal. The route currently runs between Russellville, KY (at U.S. Highway 68 and KY 80). Round Rock, TX (at Interstate 35, ten miles n. of Austin. Not one of the original 1926 U.S. highway routes, it was plotted in 1935 with the original eastern terminus at W. Memphis, AR. For now, the images reflect the route between Round Rock and Bryan.