what is the longest highway in the united states
U.S. Route 20 U.S. Route 20 (US 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. Spanning 3,365 miles (5,415 km), it is the longest road in the United States,[2] and the route roughly parallels that of Interstate 90 (I-90). There is a discontinuity in the official designation of US 20 through Yellowstone National Park, with unnumbered roads used to traverse the park.
U.S. Route 60 U.S. Route 60 (US 60) is an east–west United States highway, traveling 2,670 mi (4,300 km) from southwestern Arizona to the Atlantic coast in Virginia. Despite the final "0" in its number, indicating a transcontinental designation, the 1926 route formerly ended in Springfield, Missouri, at its intersection with the major US 66. In fact, US 66 was almost given the US 60 number.