longest highway in the u.s.?
The majority of the world's 10 longest highways are located in the US, including the world's longest-the Pan American Highway-which spans a whopping 48,000km. Roadtraffic-technology.com lists the 10 longest highways in the world by total length.
6. Interstate 80 (I-80). Interstate 80 (I-80) is the second longest after the Interstate 90 Highway in the United States. This road connects downtown San Francisco, California, to Teaneck, New Jersey.