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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 ]
As of 2022, about one quarter of all vehicle miles driven in the country used the Interstate Highway System, [6] which has a total length of 48,890 miles (78,680 km). [2] In 2022 and 2023, the number of fatalities on the Interstate Highway System amounted to more than 5,000 people annually, with nearly 5,600 fatalities in 2022. [7]
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]
President Franklin D. Roosevelt saw highways as both essential to national defense and the economy, as well as a means of putting unemployed people to work. On April 14, 1941, Roosevelt appointed a National Interregional Highway Committee to study the need for a limited system of national inter-state highways. [1]
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]
The National Highway System (NHS) is a network of strategic highways within the United States, including the Interstate Highway System and other roads serving major airports, ports, military bases, rail or truck terminals, railway stations, pipeline terminals and other strategic transport facilities. Altogether, it constitutes the largest ...
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.
In addition to the 48 contiguous states, Interstate Highways are found in Hawaii, Alaska, and Puerto Rico. The Federal Highway Administration funds four routes in Alaska and three routes in Puerto Rico under the same program as the rest of the Interstate Highway System. However, these routes are not required to meet the same standards as the ...