US 20 (ID/MT) Travel Info
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U.S. Route 20 (US 20) is an east–west United States highway. The "0" in its route number indicates that US 20 is a coast-to-coast route. Spanning 3,365 miles (5,415 km), it is the longest road in the United States, and the route roughly parallels that of Interstate 90 (I-90). However, since numbered US routes are not designated as such within the boundarie ... more
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