I did this trek yesterday to pick my brother up from UW. I left work in the Union Grove area, took 11 all the way to 90 then made my way to Madison, about 9 miles before the 12/18 exit off 90, the traffic slowed to a 5-10mph crawl. Everyone had to get off. So then I made the slow exit and noticed almost 75% of cars then trying to get off on 51N to continue their trips to where ever. Unfortunately the police were in the process of closing that exit. I would imagine partly because of sheer volume of cars "trying to find their way". It was a mess indeed, but what I heard was that the trek through Beloit, was the only guaranteed non-flooded route. Along 11 for me, we had to stop and go around a flooded area by driving on what I would call a temporary alley detour. Barely wide enough for two cars, let alone semis that were behind me. On a lighter side. As we returned to Milwaukee, along the closed 94W, some kids were riding their bikes & mopeds, and one kid had one of those long street louge boards and was climbing a hill. I guess some people found some fun. I just hope no one crosses over into that closed road.