In Kansas City, Missouri, they installed a bunch of red light cameras and a bunch of false cameras (just boxes mounted on stoplights to look like cameras). The real ones and fake ones were published quickly (with whether they were real) and it had 2 major consequences. First, the traffic courts were quickly overwhelmed with challenges, and it became normal to wait 5-7 months before getting a court date for running a light. Second, several of the intersections with cameras saw a quick increase in accidents, as people were so terrified of a ticket that they would not worry about being rear-ended when stopping very abruptly.