Add another study to the growing body of evidence that red-light cameras cause more accidents than they prevent. University of South Florida researchers found drivers are more likely to attempt to stop abruptly at camera intersections than otherwise, which results in a significant increase in injuries from rear end collisions. Red-light cameras are designed to snap a photo of a cars license plate if the driver moves through the intersection under a red light. The theory should hold that if drivers know theyre being watched, theyll be less likely to run the lights.