The Tri-State Tollway is a controlled-accesstoll road in the northeastern part of the U.S. state of Illinois. Originally U.S. Route 41 Toll, it follows:
Interstate 80 from I-94/I-294/IL 394 in South Holland to I-294 in Hazel Crest;
Interstate 294 from I-80/I-94/IL 394 in South Holland to I-94 in Northbrook; and
Interstate 94 from I-294 in Northbrook to I-41/US 41 in Newport Township.