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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 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 ...
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 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 ...
State Route 25 (SR 25), named the Coulee Reservoir Highway, is a 121.17-mile-long (195.00 km) state highway serving communities in Lincoln and Stevens counties in the U.S. state of Washington. The highway begins at an intersection with U.S. Route 2 (US 2) east of Davenport and continues northwest to cross the Spokane River .
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 99 (SR 99), also known as the Pacific Highway, is a state highway in the Seattle metropolitan area, part of the U.S. state of Washington. It runs 49 miles (79 km) from Fife to Everett , passing through the cities of Federal Way , SeaTac , Seattle , Shoreline , and Lynnwood .