U.S. Highway 41 (US 41) is a north–south highway United States Numbered Highway in eastern Wisconsin. It runs from Pleasant Prairie on the Illinois border north to Marinette on the Michigan border. Most of the route is concurrent with Interstate 41 in the state, with the exception of the portion between Howard, a suburb of Green Bay, and Marinette. Route description US 41 is a freeway for nearly 85 percent of its route through Wisconsin, with the exceptions being a expressway section from the US 141 interchange in Oconto County to Marinette and a surface arterial section within Marinette. The highway runs concurrently with I-94 from Milwaukee to the Illinois border and concurrently with I-41 from Howard to the Illinois border. US 41 runs northwest from Milwaukee and passes Fond du Lac, Oshkosh, and Appleton before heading to Green Bay. The route is a major access point for American Family Field, home of the Milwaukee Brewers Major League Baseball club, the EAA AirVenture Oshkosh air show in Oshkosh, and for Lambeau Field, the home of the Green Bay Packers NFL football team. After leaving Green Bay, US 41 continues north to Abrams co-signed with US 141, and then it turns east off the co-signed route toward Marinette and into Michigan. History The first alignment of US 41 in Wisconsin, which extended south from Marinette to the Illinois state line, was defined generally by two state trunk highways in existence in 1926: WIS 15 from Marinette to Milwaukee, and WIS 57 from Milwaukee to the Illinois state line. Signs for the newly established highway were to be placed in spring of 1927. A meeting of the Wisconsin Highway Commission in 1926 decided that no new U.S. Highway number would overlap with an existing state route number; therefore, WIS 41 was retired and renumbered when US 41 came into existence. In Milwaukee the original routing of US 41 used Lisbon Avenue east to North 27th Street, then south along that road to the Illinois state line. After the Stadium Freeway was built in the 1960s, US 41 followed that road from Lisbon Avenue south across I-94 to National Avenue and then east to 27th Street, which is known as Layton Boulevard between National Avenue and Lincoln Avenue. WisDOT rerouted US 41 along I-94 from the Stadium Interchange to the Illinois state line, removed Layton Boulevard north of Forest Home Avenue from the