 The highway, also known as the Maple Valley Highway, functions as a major rural and suburban route for the southeastern Seattle metropolitan area and connects several highways, including SR 410, SR 18, and Interstate 405 (I-405).The Enumclaw–Maple Valley–Renton highway was built in 1914 and expanded in the early 1930s by the county government.It was absorbed into the state highway system in 1937 and designated as a branch of Primary State Highway 5 and renumbered to SR 169 in 1964.