What is the longest highway in the U.S.? Trivia Answer
Measuring nearly 3,102 miles in length, Interstate 90, or I-90, is the longest interstate highway in the U.S. It spans 13 states: Washington, Idaho, Montana, Wyoming, South Dakota, Minnesota, Wisconsin, Illinois, Indiana, Ohio, Pennsylvania, New York and Massachusetts. Following in a close second is Interstate 80, which crosses 11 states and measures just shy of 2,900 miles. These highways serve five of the same states: Wyoming, Indiana, Illinois, Ohio and Pennsylvania. Source: The Weather Channel.