Make a U-TURN and go back to I-43
U.S. 12 is a freeway from I-43 to virtually the state line. It ends just shy of the Illinois state line by Genoa City. It should be 4 lanes from there to Chicago, but Illinois has been dragging their feet and it is not certain when it will be completed. Eventually, U.S. 12 will be an alternate route from Chicago to Madison.