Would just like to add that by the sounds of things that camera was a Traffic Signal and not a speed camera. Speed Cameras are alot larger. The thin ones on the side of the road next to the lights are thin. These dont measure speed, just red lights. The camera has to be pointing the way your going ie behind you, unless its a Truvelo which use infa red instead of Radard like the Gatsos, these take a photo of the car and driver but dont flash, this is so the driver cant lie and say someone else was driving.
Just thought i would share my knowledge with you all as ive had alot of run-ins...