I have just been hearing that a speed camera on the A3 that I have a lot of respect for generates the most income per year of any speed camera....something like 8 million squidd per year. Oddly though I have never ever seen it fire and if you had asked me which of the many on the A3 it was I would have said the southbound one just after the Roehampton traffic lights, just before Asda....as that fires constantly. I know I am a speedy thing and the bit after the M25 past Esher Common is a fab bit of road, but I will certainly have even more respect for the speed camera at the end of the 3 lanes in future!!