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The Inter-American Highway (IAH) is the Central American section of the Pan-American Highway and spans 5,470 kilometers (3,400 mi) between Nuevo Laredo, Mexico, and Panama City, Panama. History [ edit ]
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]
The Pershing Map was an early blueprint for a national highway system in the United States, with many of the proposed roads later forming a substantial portion of the Interstate Highway System. [1] It's the first official United States road map, and many of the proposed roadways were later incorporated into the current highway system.
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 ...
1933 map of the Inter-American Highway portion of the Pan-American Highway. The official route of the Pan-American Highway through Mexico (where it is known as the Inter-American Highway) starts at Nuevo Laredo, Tamaulipas (opposite Laredo, Texas), and goes south to Mexico City along Mexican Federal Highway 85. [15]
With an original authorization of $25 billion (equivalent to $215 billion in 2023) [1] for the construction of 41,000 miles (66,000 km) of the Interstate Highway System over a 10-year period, it was the largest public works project in American history through that time. [2]
The Federal-Aid Highway Act of 1944 covered federal spending on highways "after the war", which (after World War II ended in August 1945) meant spending in fiscal 1946, 1947, and 1948. Among the act's provisions were: [8] Creation of a 40,000-mile (64,000 km) National System of Interstate Highways to connect major cities and industrial areas.
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.