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The National Road (also known as the Cumberland Road) [1] was the first major improved highway in the United States built by the federal government.Built between 1811 and 1837, the 620-mile (1,000 km) road connected the Potomac and Ohio Rivers and was a main transport path to the West for thousands of settlers.
A map of the Strategic Highway Network, one component of the NHS Map of average freight truck traffic on the NHS in 2015. According to the Federal Highway Administration, the 160,000-mile (260,000 km) National Highway System includes roads important to the United States' economy, defense, and mobility, from one or more of the following road networks (specific routes may be part of more than ...
United States Numbered Highways are the components of a national system of highways administered by the American Association of State Highway and Transportation Officials (AASHTO), a nonprofit, nonpartisan association, [3] and the various state departments of transportation.
The farthest western terminus for the National Road was the Old State House in Vandalia, Illinois. [35] The National Road was absorbed into the National Old Trails Ocean-to-Ocean highway, a route from New York, New York, to Los Angeles, California in the early 20th century. The National Road became US 40 in the original 1925 plan for U.S. Routes.
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.
After the national implementation of the Interstate Highway System, many U.S. Routes that had been bypassed or overlaid with Interstate Highways were decommissioned and removed from the system. In some places, the U.S. Routes remain alongside the Interstates and serve as a means for interstate travelers to access local services and as secondary ...