Redflex technology is designed to photograph only those vehicles entering the intersection after the light has turned red. While drivers who fear a ticket for red light running can cause a rear-end collision by applying their brakes too quickly, these types of accidents are far less dangerous than the typical right-angle collision caused by red light running. This suggests a positive aggregate benefit.
A 2007 study of three Iowa communities equipped with red light cameras found no increase in rear-end collisions. A 2005 study in Raleigh, North Carolina, showed a 25% reduction in rear-end accidents. Columbus, Ohio experienced an 81% decrease in rear-end collisions at its first installed intersections after one year.