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The "0" in its route number indicates that US 20 is a major coast-to-coast route. Spanning 3,365 miles (5,415 km), it is the longest road in the United States, [1] and, in the east, the route is roughly parallel to Interstate 90 (I-90), which is the longest Interstate Highway in the U.S.
Interstate 90 (I-90) is an east–west transcontinental freeway and the longest Interstate Highway in the United States at 3,021 miles (4,862 km). It begins in Seattle, Washington, and travels through the Pacific Northwest, Mountain West, Great Plains, Midwest, and the Northeast, ending in Boston, Massachusetts.
Longest road route in India. U.S. Route 20: 5,415 km (3,365 mi) United States: ... Longest Interstate Highway in the United States Interstate 80: 4,666 km (2,899 mi)
Shortest Interstate highway in contiguous United States I-87: 333.49: 536.70 I-278 in New York City: ... Longest primary north-south Interstate highway I-96: 192.06:
In the United States, each state maintains its own system of state highways. [a] This is a list of the longest state highways in each state.As of 2007, the longest state highway in the nation is Montana Highway 200, which is 706.624 miles (1,137.201 km) long.
Since the policy on numbering and designating US Highways was updated in 1991, AASHTO has been in the process of eliminating all intrastate U.S. Highways under 300 miles (480 km) in length, "as rapidly as the State Highway Department and the Standing Committee on Highways of the American Association of State Highway and Transportation Officials ...
In 1926, the United States Numbered Highway System was established, creating the first national road numbering system for cross-country travel. The roads were funded and maintained by U.S. states, and there were few national standards for road design. United States Numbered Highways ranged from two-lane country roads to multi-lane freeways.
U.S. Route 20 (US 20) is a transcontinental east–west U.S. Highway that travels between Newport, Oregon, and Boston, Massachusetts.It passes through southern Montana for approximately 10 miles (16 km), connecting Targhee Pass at the Idaho state line to the town of West Yellowstone and the West Entrance of Yellowstone National Park near the Wyoming border.