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The U.S. state of Washington has over 7,000 miles (11,000 km) of state highways maintained by the Washington State Department of Transportation (WSDOT). [1] The highway system is defined through acts by the state legislature and is encoded in the Revised Code of Washington as State Routes (SR).
The system spans 8.5% of the state's public road mileage, but carries over half of the traffic. [2] [3] All other public roads in the state are either inside incorporated places (cities or towns) or are maintained by the county. [4] The state highway symbol is a white silhouette of George Washington's head (whom the state is named after).
The state of Washington began maintaining sections of what would become US 2 with the extension of State Road 7 in 1909, from Peshastin to Spokane on the Sunset Highway and later State Road 2. In addition to State Road 2, State Road 23 was created in 1915, traveling north from Spokane to Newport, and was renumbered to State Road 6 in 1923.
The United States Numbered Highway System in Washington covers 1,870 miles (3,009.5 km) and consists of eight highways, divided into four primary routes and four auxiliary routes. The United States Numbered Highway System was approved and established on November 11, 1926 by the American Association of State Highway Officials (AASHO) and ...
[1] [8] They connect the major cities and metropolitan areas of the state, working in concert with the U.S. routes and state routes also maintained by WSDOT. [9] The longest route, I-90, is 298 miles (480 km) and connects the state's two largest cities, Seattle and Spokane; the shortest is I-705 at 1.5 miles (2.4 km).
The state legislature created another classification—the code city—in 1967 to grant greater control to cities, who sought expanded home rule authority to address complex issues as they urbanized. As of 2022 [update] , the state has 197 municipalities that are code cities—the most of any classification. [ 3 ]
State Route 20 (SR 20), also known as the North Cascades Highway, is a state highway that traverses the U.S. state of Washington.It is the state's longest highway, traveling 436 miles (702 km) across the northern areas of Washington, from U.S. Route 101 (US 101) at Discovery Bay on the Olympic Peninsula to US 2 near the Idaho state border in Newport.
State Route 202 (SR 202) is a state highway in the U.S. state of Washington, serving part of the Seattle metropolitan area. It runs southeasterly for 31 miles (50 km) in the Eastside region of King County , connecting Woodinville , Redmond , Fall City , and North Bend .