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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 ...
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 .
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 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 road to Mowich Lake was completed in 1933. [11] In 1937, State Road 5 was renamed Primary State Highway 5, and what is now SR 165 was the Enumclaw-Fairfax branch of that highway (except between Enumclaw and Buckley, which is now SR 410). The road to Mowich lake was completed in 1933, but remained closed to vehicular traffic until 1955. [15]
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In 1979, the state government funded a $1.4 million project to widen the southernmost section of SR 539 to four lanes with a turn lane between I-5 and Kellogg Road. [51] The highway was later identified as among the state's most dangerous, with 714 collisions and nine deaths from 1988 to 1993 and 314 collisions and three deaths from 1999 to 2003.
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.