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U.S. Route 20

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High Quality Content by WIKIPEDIA articles! U.S. Route 20 is an east?west United States highway. As the "0" in its route...

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High Quality Content by WIKIPEDIA articles! U.S. Route 20 is an east?west United States highway. As the "0" in its route number implies, U.S. 20 is a coast-to-coast route; however, because national park roads do not have signage for U.S. numbered highways, a gap exists through Yellowstone National Park and splits the route into two sections. Spanning 3,365 miles (5,415 km), it is the longest road in the United States, and the route that sparsely parallels Interstate 90. It and U.S. Route 30 break the general U.S. route numbering rules in Oregon, since U.S. 30 actually starts north of U.S. Route 20 and runs parallel to the north throughout the state. The two overlap and continue in the "correct" positioning near Caldwell, Idaho. This is because U.S. 20 was not a planned coast-to-coast route while U.S. 30 was. U.S. 20 originally ended at the eastern entrance of Yellowstone Park; it was extended in 1940.