Interstate 91 (I-91) is a major north-south highway in the northeastern United States. It runs approximately 290 miles, connecting New Haven, Connecticut to Houlton, Maine. The highway primarily serves the states of Connecticut, Massachusetts, and Vermont, facilitating travel and commerce in the region. I-91 is known for its scenic views, especially as it passes through the Connecticut River Valley. It connects several important cities, including Hartford and Springfield, and provides access to various attractions, such as Mount Tom State Reservation and Brattleboro in Vermont. The highway plays a crucial role in regional transportation.