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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 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 ...
All state highways are designated by the Washington State Legislature and codified in the Revised Code of Washington (RCW), namely Chapter 47.17 RCW. These routes are defined generally by termini and points along the route; WSDOT may otherwise choose the details, and may bypass the designated points as long as the road serves the general vicinity.
The Washington state highway system was changed to its current "sign route system" beginning in January 1963 with a state highway renumbering. [63] Under the new system, Interstate highways, U.S. routes, and state routes replaced the primary and secondary highways and were codified under the Revised Code of Washington in 1970. [3]
Part of Dix–Toledo Highway; labeled "I-75 connector" on state maps; previously part of US 25 and later Connector 3 [234] Connector 25: 0.265: 0.426 BL I-69/BL I-94 in Port Huron: M-25 in Port Huron 1973 [240] current Labeled "I-94 connector" on state maps; previously part of US 25 [240] and later Connector 13 [234] Connector 30: 0.629: 1.012
Known as the Evergreen Highway, the route followed State Route 14 (designated as Washington State Route 12 from 1964–67) from Vancouver, Washington to Maryhill, U.S. Route 97 from Maryhill to Toppenish and State Route 22 from Toppenish to Buena.
MDOT is the agency responsible for the day-to-day maintenance and operations of the State Trunkline Highway System, which includes the U.S. Highways in Michigan.The numbering for these highways is coordinated through AASHTO, [6] an organization composed of the various state departments of transportation in the United States. [7]
In addition to the state scenic highways system, several routes in Washington are designated as National Scenic Byways and All-American Roads. [23] Cascade Loop National Scenic Byway (2021) [24] Chinook Scenic Byway (1998), an All-American Road [25] Coulee Corridor Scenic Byway (2005) [26] International Selkirk Loop (2005), an All-American Road ...