The Interstate Highway System, formally the Dwight D. Eisenhower National System of Interstate and Defense Highways, is a network of controlled access highways spanning the United States, including Alaska, Hawaii and Puerto Rico. It was established by the Federal-Aid Highway Act of 1956, which provided funding for the construction of more than 40,000 miles of roads under President Eisenhower's support. The system runs to roughly 48,890 miles in length. Construction of the originally planned network was declared complete in 1992, although some stretches deviated from the 1956 plan or fell short of federal standards.
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