I can say without fear of contradiction that no one had ever ran a red light in my county up until nine years ago. That was when we got our first two, and those are all we have now. There have been some terrible accidents, several fatal, since then. Eighteen-wheelers blow through them at 65-75 mph regularly. I have seen them lock the wheels and raise enough smoke to choke a small family as they skidded through. Local people are almost educated now, realizing that they might have to stop at an intersection they haven't had to worry about for the previous 60 years.