Tri-State Tollway

The Tri-State Tollway is a U.S. toll road maintained by the Illinois State Toll Highway Authority (ISTHA) in northeastern Illinois which is considered one of the most heavily traveled highways in the country (according to the IBTTA, the tollway is the nation's 4th busiest toll road). It is actually a combination of three different Interstates:

• Interstate 80 (I-80) between I-94 at Thornton and I-294 near Hazel Crest
• I-294, which is routed concurrently with I-80 to Hazel Crest, and then turns north to Deerfield
• I-94 north from Deerfield to U.S. Route 41 (US 41).