The Interstate Highway System: A testament to ambition and perseverance

When it finally opened to traffic on Oct. 14, 1992, the 12.5 mi segment of Interstate 70 through Glenwood Canyon, on the Western Slope of Colorado, completed what may be America’s greatest public works project: the federal Interstate Highway System. These last miles may very well have been the hardest.

Plans for a national network of roads had been under consideration since just after World War I, but America’s modern interstate system began with the passage of the 1956 Federal Aid Highway Act, which authorized construction of a 40,000 mi network — now officially known as the Dwight D.

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