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The Federal Highway Administration has an official myth-busting page. Here is their answer to two questions of whether interstates were built with defense purposes in mind:
President Eisenhower supported the Interstate System because he wanted a way of evacuating cities if the United States was attacked by an atomic bomb.
President Eisenhower’s support was based largely on civilian needs—support for economic development, improved highway safety, and congestion relief, as well as reduction of motor vehicle-related lawsuits. He understood the military value of the Interstate System, as well as its use in evacuations, but they were only part of the reason for his support.
Defense was the primary reason for the Interstate System.
The primary justifications for the Interstate System were civilian in nature. In the midst of the Cold War, the Department of Defense supported the Interstate System and Congress added the words “and Defense” to its official name in 1956 (“National System of Interstate and Defense Highways”). However, the program was so popular for its civilian benefits that the legislation would have passed even if defense had not been a factor.