page_title: U.S. Route 20
section_title: New York
hierarchical_section_title: U.S. Route 20 / Route description / New York
caption_attribution_description: English: U.S. Route 20 marker in Oneida County, NY
context_page_description: U.S. Route 20 or U.S. Highway 20 is an east–west United States highway that stretches from the Pacific Northwest all the way to New England. The "0" in its route number indicates that US 20 is a coast-to-coast route and major route. Spanning 3,365 miles, it is the longest road in the United States, and the route is roughly parallel to that of the newer Interstate 90, which is in turn 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.
  US 20 and US 30 break the general U.S. Route numbering rules in Oregon, since US 30 actually starts north of US 20 in Astoria, and runs parallel to the north throughout the state. The two run concurrently and continue in the correct positioning near Caldwell, Idaho. This is because US 20 was not a planned coast-to-coast route while US 30 was. US 20 originally ended at the eastern entrance of Yellowstone Park; it was extended in 1940.
  The highway's eastern terminus is in Boston, Massachusetts, at Kenmore Square, where it meets Route 2.
context_section_description: In New York, US 20 runs roughly parallel to the New York State Thruway (I-90) throughout the state. The route runs concurrently with New York State Route 5 twice, with the second overlap extending 68 miles (109 km) across Western and Central New York from Avon to Auburn. US 20 runs across the rural Cherry Valley Turnpike between Skaneateles and Albany. US 20 was also known as the Boston-Buffalo highway prior to the construction of the New York Thruway and Massachusetts Turnpike.
caption: US 20 marker, east of Sangerfield, New York
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