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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 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 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 ...
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 ...
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.
State Road 9 became Primary State Highway 9 (PSH 9), while State Road 12 became PSH 12; both remained co-signed with US 101. [37] The Washington State Highway Commission submitted an application to AASHO in 1955 to extend US 101 northeast from Discovery Bay to Whidbey Island and Mount Vernon, where it would terminate at US 99. [38]
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.
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.
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