Think of it as a football Saturday ? complete with 80,000 exuberant fans, bustling beer tents and snarled traffic ? only during the work week. The University of Wisconsin football team?s highly anticipated season opener Thursday night against UNLV will showcase a new but veteran quarterback and a team that?s nationally ranked with hopes of again becoming Big Ten champions. But the big event also could create big headaches for travelers during the afternoon and into the rush hour. So if you?re not passionate about Badger football or don?t have a ticket to the game, it?s probably best to steer clear of campus starting around noon Thursday. The game, which starts at 7 p.m., will be shown on ESPN and will be the first game of the college football season shown on a major network.