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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.
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.
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 ...
In 1925, the Joint Board on Interstate Highways, recommended by the American Association of State Highway Officials (AASHO), worked to form a national numbering system to rationalize the roads. After several meetings, a final report was approved by the U.S. Department of Agriculture in November 1925.
This is a list of countries (or regions) by total road network size, both paved and unpaved.Also included is additional data on the length of each country or region's controlled-access highway network (also known as a motorway, expressway, freeway, etc.), designed for high vehicular traffic.
The highway system of the United States is a network of interconnected state, U.S., and Interstate highways. Each of the fifty states, the District of Columbia, Puerto Rico, American Samoa, Guam, the Northern Mariana Islands, and the U.S. Virgin Islands own and maintain a part of this vast system, including U.S. and Interstate highways, which are not owned or maintained at the federal level.
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.
The state highway system consists of about 8,000 miles (13,000 km) of state highways, that is, roadways owned and maintained by ODOT.When minor connections and frontage roads are removed, that number drops to approximately 7,400 miles (11,900 km) or around 9% of the total road mileage in the state.