The roadway between Lubbock and Amarillo was part of the Puget Sound to Gulf Highway (State Highway 9), one of the original state highways defined in 1917. In 1926, it became part of U.S. Highway 385, which was absorbed into U.S. Highway 87 in 1935. The SH 9 overlap was dropped in the 1939 renumbering. Paving began in 1929 near Plainview, and was almost complete by 1940, with only about 8 miles (13 km) south of Canyon still bituminous surfaced until later that decade. The Canyon Expressway, a freeway upgrade of US 87 (also US 60 there) between Canyon and Amarillo, was built in the late 1950s and early 1960s. This highway, with a design speed of 45 miles per hour (70 km/h), included frontage roads along its entire length, and ended in each city with a wye junction: the split of US 60 and US 87 in Canyon, and a split between the two one-way pairs of Taylor and Fillmore Streets and Pierce and Buchanan Streets in Amarillo. The Dumas Expressway, a freeway upgrade of US 87 north from Amarillo, opened several years later, feeding into the same one-way pairs.