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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 Washington state highway system was changed to its current "sign route system" beginning in January 1963 with a state highway renumbering. [63] Under the new system, Interstate highways, U.S. routes, and state routes replaced the primary and secondary highways and were codified under the Revised Code of Washington in 1970. [3]
A map of PSH 5 and its branches. After US 12 was extended through Washington in 1967, SR 410 used the Sumner–Buckley branch as well as the main highway to Naches for its route. In 1923, the state highway system was restructured completely, incorporating numbers instead of names.
The road now designated SR 900 was originally added to the state highway system in 1909, as an extension of the Snoqualmie Pass Road (State Road 7) which was completed for through traffic across the pass in 1915. At the time the highway was the main thoroughfare between Seattle and Spokane, with a route then around the south end of Lake Washington.
SR 99 follows a section of former U.S. Route 99 (US 99) within the Seattle metropolitan area, from Fife to southern Everett. [2] It is officially designated as the William P. Stewart Memorial Highway, but is commonly known as the Pacific Highway or by one of its local names. [2]
Interstate 5 (I-5) is an Interstate Highway on the West Coast of the United States that serves as the region's primary north–south route. It spans 277 miles (446 km) across the state of Washington, from the Oregon state border at Vancouver, through the Puget Sound region, to the Canadian border at Blaine.
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.
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