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Interstate 70 passes through Colorado on its route between its western terminus at Cove Fort, Utah, and its eastern at Baltimore, Maryland. In western Colorado, the highway connects the metropolitan areas of Grand Junction and Denver via a route through the Rocky Mountains. Bicycles are allowed on those stretches of I-70 in the Rockies where no other through route exists. The United States Department of Transportation (USDOT) lists the construction of I-70 among the engineering marvels undertaken in the Interstate Highway system. The Eisenhower Tunnel, with a maximum elevation of 11,158 feet (3,401 m) and length of 1.7 miles (2.7 km), is the longest mountain tunnel and highest point along the Interstate Highway System. The portion through Glenwood Canyon was completed on October 14, 1992, one of the final pieces of the Interstate Highway System to open to traffic, and one of the most expensive rural highways per mile built in the United States. (Full article)