Interstate 41 (I-41) is a 176.33-mile-long (283.78 km) Interstate Highway connecting the interchange of I-94 and U.S. Route 41 (US 41), located 0.9 miles (1.4 km) south of the Wisconsin–Illinois border at the end of the Tri-State Tollway in metropolitan Chicago, to an interchange with I-43 in metropolitan Green Bay, Wisconsin. The designation travels concurrently with US 41, I-894, US 45, and sections of I-94 in Wisconsin and Illinois.