MADISON, Wis. – Some bicyclists on the University of Wisconsin-Madison campus were surprised Tuesday night when they were stopped by police because of safety concerns. State law requires bicyclists to have at least a front light on their bikes after sunset. The fine for not having a bike light is about $160. UW-Madison police on Tuesday stopped bikers who were violating the law, but instead of ticketing them, they educated them and also set them up with free front and back lights for their bikes.