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The system includes 4% of the nation's roads, but carries more than 40% of all highway traffic, 75% of heavy truck traffic, and 90% of tourist traffic. [2] All urban areas with a population of over 50,000 and about 90% of America's population live within 5 miles (8.0 km) of the network, [2] which is the longest in the world. [9]
[citation needed] The reverse happened with U.S. Route 57, originally a Texas state highway numbered to match Mexican Federal Highway 57. [9] In the 1950s, the numbering grid for the new Interstate Highway System was established as intentionally opposite from the US grid insofar as the direction the route numbers increase.
The growing transportation systems in the United States did not develop just through historical transportation uses such as horses and wagons. [1] The exploration experiences of the Spanish, British, and French settlers as they sailed through the ocean reaching land became an opportunity to develop possible transportation systems.
The Interstate Highway System gained a champion in President Dwight D. Eisenhower, who was influenced by his experiences as a young Army officer crossing the country in the 1919 Motor Transport Corps convoy that drove in part on the Lincoln Highway, the first road across America. He recalled that, "The old convoy had started me thinking about ...
Since the policy on numbering and designating US Highways was updated in 1991, AASHTO has been in the process of eliminating all intrastate U.S. Highways under 300 miles (480 km) in length, "as rapidly as the State Highway Department and the Standing Committee on Highways of the American Association of State Highway and Transportation Officials ...
In 1910, the American Association for Highway Improvement was organized. Funding came from automobile registration, and taxes on motor fuels, as well as state aid. By 1914, there were 2.4 million miles of rural dirt rural roads; 100,000 miles had been improved with grading and gravel, and 3,000 miles were given high-quality surfacing.
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The United States Numbered Highway System is an older system consisting mostly of surface-level trunk roads, coordinated by the American Association of State Highway and Transportation Officials and maintained by state and local governments. U.S. Highways have been relegated to regional and intrastate traffic, as they have been largely ...