Interstate 41 (I-41) is a 175.00-mile-long (281.64 km) north–south Interstate Highway connecting the interchange of I-94 and U.S. Route 41 (US 41), located 2.50 miles (4.02 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 for its entire length, as well as portions of I-894, US 45, I-43, and sections of I-94 in Wisconsin and Illinois. The route was officially added to the Interstate Highway System on April 7, 2015, and connects Milwaukee and Green Bay with the Fox Cities.
Newly installed I-41/US 41 sign south of WIS 145 near Richfield from June 2015
Markers for I-41, I-43, and I-894 on the Airport Freeway, the southern bypass of Milwaukee; this is one of three instances of a wrong-way concurrency in the United States involving two Interstate highways. It is also one of only two places in the United States where three Interstate Highways share the same roadway.
Interstate 94 in Illinois
Interstate 94 (I-94) generally runs north–south through the northeastern portion of the US state of Illinois, in Lake and Cook counties. It is signed east–west in Illinois in accordance with its general alignment across the country, with west signage aligned with northbound travel and vice versa. I-94 in Illinois is 61.53 miles (99.02 km) long.
I-94 approaching a combination interchange with I-80/I-294/IL 394
