High Quality Content by WIKIPEDIA articles! Interstate 470 (I-470) is a 13.72-mile (22.08 km) loop highway that bypasses the downtown area of Topeka, Kansas . I-470 begins at I-70 in western Topeka and heads southeast, running concurrent with U.S. Route 75 (US 75). At the I-470 junction with I-335, the freeway becomes part of the Kansas Turnpike until I-470 reaches its eastern terminus with I-70. The Kansas Turnpike was opened in the 1950s, comprising the eastern portion of the route. Several years later, in the early 1960s, the western section of I-470 was opened to traffic.