 The first iteration followed present day US 41 from the Illinois border to Marinette via Milwaukee, Fond du Lac, Appleton and Green Bay.The second is the more well-known alignment following the present day Interstate 43 from the Hale Interchange in Milwaukee to Interstate 90 in Beloit as the Rock Freeway.From the Hale Interchange, This iteration followed Interstate 894 northward then turned east onto National Avenue and ending in downtown Milwaukee.