Ten years ago Illinois legislators allowed Chicago-area suburbs to install red light cameras, but with some caveats: The state transportation department would need to approve them, and then only for the most dangerous intersections. But a Tribune analysis found that often didn’t happen. More often than not these cameras were placed at intersections that didn’t meet the state threshold to qualify for a camera.
A follow-up story (archive) explored how often suburbs agreed to issue tickets based on reports from the camera vendor. Some municipalities only agreed with the vendor 11 percent of the time that a violation was indeed a violation. Other municipalities issued 99.9 percent of all suggested tickets, rubber stamping the videos in seconds. For this piece I created another interactive map, this time with an accompanying interactive chart.