Interstate 81 (I-81) is a major highway in the United States that runs through the eastern part of the country. It stretches approximately 855 miles, starting in Virginia and ending in New York. The highway primarily serves as a north-south route, connecting several key cities and regions along its path. I-81 is an important transportation corridor for both commercial and personal travel. It passes through states like Tennessee, Pennsylvania, and Maryland, facilitating the movement of goods and people. The highway is known for its scenic views, particularly in the Appalachian Mountains, making it a popular route for travelers.