Mileage: 2,153.13. This east-west highway, the first one interstate project started in the United States back in 1954, spans Utah, Colorado, Kansas, Missouri, Illinois, Indiana, Ohio, West Virginia, Pennsylvania, and Maryland. It approximately traces the path of U.S. Route 40 east of the Rocky Mountains. Major cities served include Denver, Topeka, Kansas City, St. Louis, Indianapolis, Columbus, Pittsburgh, Hancock, and Baltimore.
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