U.S. Route 20 or U.S. Highway 20 (US 20) is an
east–west United States Numbered Highway that stretches from the Pacific
Northwest east to New England. The "0" in its route number
indicates that US 20 is a major coast-to-coast route. Spanning 3,365 miles,
it is the longest road in the United States. In the eastern U.S. the
route is roughly parallel to Interstate 90 (I-90), which is the longest
Interstate Highway in the U.S. There is a discontinuity in the official
designation of US 20 through Yellowstone National Park, with unnumbered roads
used to traverse the park.
The highway's eastern terminus is in Boston, Massachusetts, at
Kenmore Square, where it meets Massachusetts Route 2. Its western terminus is
in Newport, Oregon, at an intersection with US 101, within a mile of the
Pacific Ocean.
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