When you get one of these tickets you have no way of knowing what the color of the light was when the picture was taken.
Id rather spend an hour in traffic court pointing out the lack of recent calibration than have another friend go through the agony of an accident like that.
There are two intersections behind my home and we used to have at least one accident a week at one or the other. It was almost universally due to people stretching lights. The streets dept. tried everything to stop this, new traffic lights, 7 am to 6 pm crossing guards, a white strobe behind the red, changing light timing, even the re-scaping of both corners. Nothing worked. Finally, the cameras were installed and after a month or two we saw our last accident. That was about six months ago.
Based on that, Id say they work.
Owl_Eagle
Guns Before Butter.