Interstate 81, often abbreviated as I-81, is a major north-south highway in the United States. It stretches approximately 855 miles, connecting the states of Tennessee and New York. The highway primarily serves as a vital transportation route for both commercial and personal travel, facilitating the movement of goods and people across the eastern U.S. I-81 passes through several key cities, including Syracuse, Harrisburg, and Roanoke. It runs parallel to the Appalachian Mountains and provides access to various scenic areas and attractions. The highway is an important corridor for the trucking industry, linking major interstates and regional markets.