Interstate 294, also known as the Tri-State Tollway, is a major highway in the United States that runs through the state of Illinois. It serves as a vital transportation route, connecting the northern and southern suburbs of the Chicago metropolitan area. The highway spans approximately 62 miles and is primarily a toll road, facilitating efficient travel for commuters and freight. The route intersects with several other major highways, including Interstate 90 and Interstate 55, making it an essential corridor for regional traffic. It is maintained by the Illinois State Toll Highway Authority and features multiple interchanges that provide access to various local roads and communities along its path.