Also big with speed camera installations. A spate of accidents occur, speed cameras get installed. The rate of accidents falls, the speed cameras are claimed

Also big with speed camera installations. A spate of accidents occur, speed cameras get installed. The rate of accidents falls, the speed cameras are claimed to be the result. The problem is that accidents are randomly spaced (assuming some level of road design and driver training) and putting in a teepee beside the road would probably show the same effect. Particularly so if the speed camera is not obvious, so is unlikely to have an effect on a driver unless they travel the route frequently and get fined.