You can drive 3,020.54 miles on Interstate 90 without encountering a red light! That makes this highway between Seattle and Boston the longest stretch of interstate highway in the USA. This limited access highway goes through 13 states, which include WA, ID, MT, WY, SD, MN, WI, IL, IN, OH, PA, NY, MA.

The other choices are a bit shorter:

I-95 (Miami, FL to Houlton, ME) = 1,919.74 miles

I-10 (Los Angeles, CA to Jacksonville, FL) = 2,460.34 miles

I-80 San Francisco, CA to Teaneck, NJ = 2,899.54 miles

The prize for the shortest interstate stretch goes to I-97 (Annapolis to Baltimore, MD) It is only 17.62 miles.

The Interstate System in the USA has been called the Greatest Public Works Project in History. From the day President Dwight D. Eisenhower signed the Federal-Aid Highway Act of 1956, the interstate system has been a part of our culture as construction projects, as transportation in our daily lives, and as an integral part of the American way of life. Every citizen has been touched by it, if not directly as motorists, then indirectly because every item we buy has been on the interstate system at some point. President Eisenhower considered it one of the most important achievements of his two terms in office, and historians agree.

More Info: www.infoplease.com