Make a U-TURN and go back to I-43

U.S. 12 is only a freeway north of I-43 for about 2 miles, and then it merges with WI 67. Eventually, U.S. 12 will be 4 lane from there to Madison, but that may be a long time off. That would make U.S. 12 a nice alternate to I-90 from Chicago to Madison.