Introduction
As explained in the FreightWaves Classics article about Interstate 2 (I-2), there are 70 primary interstate highways in the Dwight D. Eisenhower National System of Interstate and Defense Highways (commonly known as the Interstate Highway System, or IHS). The IHS is a network of the major freeways in the United States. The oldest parts of the interstate system date back to the 1950s, although planning for the system began prior to World War II. To learn more about their history, read...
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