The Interstate Highway System is one of the, if not the, most important infrastructure projects in the United States, and it forms the backbone of the country’s transportation network. It consists of 70 primary and 323 auxiliary routes spanning over 48,000 miles of asphalt road and accounts for one-fourth of all vehicle miles driven. It is estimated that, since the network’s inception in 1956, it has fueled U.S. gross domestic product growth by 340%. Despite the network being declared complete in 1992, there are still plans to expand the network. This post discusses some of these expansion plans.
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How the Interstate Highway System Changed America
If you’ve ever driven a car in the United States, there is a high likelihood that you have driven on an interstate highway before. The Interstate Highway System is a network of 48,000 miles of limited-access freeway roads that connect every state in the contiguous 48 together. One-quarter of all vehicle-miles driven are on interstate highways.
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