The Tri-State Tollway is a toll highway in the northeastern part of the U.S. state of Illinois. 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 US 41 in Newport Township. Transportation in Lake County, Illinois Transportation in Cook County, Illinois Interstate 94 Interstate 294