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I-405 is a 30-mile (48 km) north–south freeway that serves as a bypass of I-5 through Seattle while serving the Eastside region. [3] It is listed as part of the National Highway System, identifying routes that are important to the national economy, defense, and mobility, and the state's Highway of Statewide Significance program, recognizing its connection to major communities.
The Interstate Highways in Washington are segments of the national Interstate Highway System that lie within the U.S. state of Washington.The system comprises 764 miles (1,230 km) on seven routes that are owned and maintained by the Washington State Department of Transportation (WSDOT); the design standards and numbering across the national system are managed by the Federal Highway ...
All state highways are designated by the Washington State Legislature and codified in the Revised Code of Washington (RCW), namely Chapter 47.17 RCW. These routes are defined generally by termini and points along the route; WSDOT may otherwise choose the details, and may bypass the designated points as long as the road serves the general vicinity.
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.
The highway system is defined through acts by the state legislature and is encoded in the Revised Code of Washington as State Routes (SR). It was created in 1964 to replace an earlier numbering scheme and ratified by the state legislature in 1970. The system's 196 highways are almost entirely paved, with the exception of a gravel section on SR 165.
State Route 18 (SR 18) is a 28.41-mile-long (45.72 km) state highway in the U.S. state of Washington, serving southeastern King County.The highway travels northeast, primarily as a controlled-access freeway, from an intersection with SR 99 and an interchange with Interstate 5 (I-5) in Federal Way through the cities of Auburn, Kent, Covington, and Maple Valley.
In 1926 the highway was co-designated to be part of US 10. [19] The legislature in 1931 also designated the route as part of the Washington Loop Highway. The opening of the Lake Washington Floating Bridge across Lake Washington in 1940 moved US 10/PSH 2 to the direct route, and the old alignment became Alternate US 10 and PSH 2 RE (for Renton).
State Route 181 (SR 181, named the Valley Highway) is a 6.05-mile-long (9.74 km) state highway serving King County in the U.S. state of Washington.The highway, travelling north parallel to the Green River, begins at SR 516 in Kent and ends at an interchange with Interstate 405 (I-405) in Tukwila.