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  1. 5 hours ago · The construction of the Interstate Highway System cost approximately $114 billion (equivalent to $618 billion in 2023). The system has continued to expand and grow as additional federal funding has provided for new routes to be added, and many future Interstate Highways are currently either being planned or under construction.

    • June 29, 1956; 67 years ago
    • 48,756 mi (78,465 km)
    • Interstate X (I-X)
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