7 of the Longest U.S. Interstates

(via Popular Mechanics)  Seattle to Boston. San Francisco to Teaneck, New Jersey. Even Miami to Sault Ste. Marie, Michigan. The routes U.S.’s longest interstates cover a variety of our nation’s landscape, some deluged by major metropolis traffic, others linking oceans to the heartland.  Here are 7 of the interstates with the most impact and, naturally, longest reach.