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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.
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, Massachusetts: Longest Expressway. BR-101: 4,658 km (2,894 mi) Brazil: Touros-RN: São José do Norte-RS: Longest highway in Brazil. National Highway 44: 4,658 km ...
In addition to the 48 contiguous states, Interstate Highways are found in Hawaii, Alaska, and Puerto Rico. The Federal Highway Administration funds four routes in Alaska and three routes in Puerto Rico under the same program as the rest of the Interstate Highway System. However, these routes are not required to meet the same standards as the ...
The system includes 4% of the nation's roads, but carries more than 40% of all highway traffic, 75% of heavy truck traffic, and 90% of tourist traffic. [2] All urban areas with a population of over 50,000 and about 90% of America's population live within 5 miles (8.0 km) of the network, [2] which is the longest in the world. [9]
[a] This is a list of the longest state highways in each state. As of 2007 [update] , 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.
The first stack interchange in the world was the Four Level Interchange (renamed the Bill Keene Memorial Interchange), built in Los Angeles, California, and completed in 1949, at the junction of U.S. Route 101 and State Route 110. [3]
Interstate 10 (I-10) is the southernmost transcontinental highway in the Interstate Highway System. I-10 is the fourth-longest Interstate in the United States at 2,460.34 miles (3,959.53 km), following I-90, I-80, and I-40. This freeway is part of the originally planned network that was laid out in 1956, and its last section was completed in 1990.