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The Interstate Highway System covers about 764 miles (1,230 km) in Washington and consists of three primary routes and four auxiliary routes. [1] [8] They connect the major cities and metropolitan areas of the state, working in concert with the U.S. routes and state routes also maintained by WSDOT. [9]
The Pershing Map FDR's hand-drawn map from 1938. The United States government's efforts to construct a national network of highways began on an ad hoc basis with the passage of the Federal Aid Road Act of 1916, which provided $75 million over a five-year period for matching funds to the states for the construction and improvement of highways. [8]
[1] [2] Notable sections of state highways include the six crossings of the Cascade Range - the Columbia River Gorge , White Pass , Chinook Pass , Snoqualmie Pass , Stevens Pass , and the North Cascades Highway . [9] Of the 13 public road crossings of the Canada–US border in Washington, nine are on state highways. [10]
In 1918, Wisconsin became the first state to number its highways in the field followed by Michigan the following year. [1] In 1926 the American Association of State Highway Officials (AASHO) established and numbered interstate routes (United States Numbered Highways), selecting the best roads in each state that could be connected to provide a national network of federal highways.
There are 71 primary Interstate Highways in the Interstate Highway System, a network of freeways in the United States. These primary highways are assigned one- or two-digit route numbers, whereas their associated auxiliary Interstate Highways receive three-digit route numbers. Typically, even-numbered Interstates run east–west, with lower ...
In 1952, AASHO permanently recognized the splits in US 11, [15] US 19, US 25, US 31, US 45, US 49, US 73, and US 99. [ 15 ] For the most part, the U.S. Routes were the primary means of inter-city vehicle travel; the main exceptions were toll roads such as the Pennsylvania Turnpike and parkway routes such as the Merritt Parkway .
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