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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 United States Numbered Highway System was approved and established on November 11, 1926 by the American Association of State Highway Officials (AASHO) and included eleven routes traveling through Washington. [1] [3] In 1961, the state introduced a set of route markers in Olympia that were colored based on destination and direction rather ...
In 1905, the road became known as State Road 1 and was incorporated into the first state highway system. [26] By 1907, the road was named the White River – Natches Road and was shortened to end at Cedar Springs. The rest of the road was transferred to State Road 5, called the Cowlitz–Natches Road, which ran from Napavine to Naches. [27]
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.
For instance, Primary State Highway 1 was the Pacific Highway (present Interstate 5), and Secondary State Highway 1B was a spur from Bellingham to the Canadian border (now State Route 539). U.S. Routes kept dual designations with State Highways. By 1952, the present highway shield, in the shape of George Washington's head, had been adopted.
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 first segment of what is now US 97 in Washington to be included in the state highway system was a road extending from Wenatchee to Twisp, designated in 1897. Since, four early highways formed the modern route of the roadway: State Road 8, State Road 3, State Road 2 and State Road 10, all signed in 1923.