http://www.speedcam.co.uk/gatso2.htm
They’re gonna spend a FORTUNE in maintenance, especially in the US.
I see you've found the pictures of the torched speed cameras. I really hadn't thought of arson, but I'll admit that it's damned effective.
Years ago, there was a test program with those things in central Texas. Car & Driver magazine, IIRC, printed a photo that came from one such unit. The vehicle, a nondescript GM van with license plates hidden with duct tape, was driven by a man wearing a ski mask. He was also pointing what appeared to be a shotgun straight at the camera.
That was that camera's final image, if memory serves.