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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.
It includes routes defined by the California State Legislature but never built, as well as routes entirely relinquished to local governments. Each state highway in California is maintained by the California Department of Transportation (Caltrans) and is assigned a Route (officially State Highway Route [ 1 ] [ 2 ] ) number in the Streets and ...
Concurrences are not explicitly codified in the Streets and Highways Code; such highway segments are listed on only one of the corresponding legislative route numbers. For example, the I-80 / I-580 concurrency, known as the Eastshore Freeway , is only listed under Route 80 in the highway code while the definition of Route 580 is broken into non ...
Longest road in the United States. [4] Ruta Nacional 40: 5,194 km (3,227 mi) Argentina: Cape Virgenes, Santa Cruz Province, Argentina: La Quiaca, Provincia de Jujuy: At km 4601 is the highest road outside the Himalayas with 5000 msal and the longest in South America. Interstate 90: 4,861 km (3,020 mi) United States: Seattle, Washington: Boston ...
It also includes the routes that were decommissioned during the 1964 state highway renumbering. Each U.S. Route in California is maintained by the California Department of Transportation (Caltrans) and is assigned a Route (officially State Highway Route [2] [3]) number in the Streets and Highways Code (Sections 300-635).
These primary highways are assigned one- or two-digit route numbers, whereas their associated auxiliary Interstate Highways receive three-digit route numbers. Typically, odd-numbered Interstates run south–north, with lower numbers in the west and higher numbers in the east; even-numbered Interstates run west–east, with lower numbers in the ...
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.
[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. The shortest of the longest state highways is District of Columbia Route 295, which is 4.29 miles (6.90 km) long.