Question is, why not set up the cameras to ticket for a small amount if you just cross the line, rising to a higher fine if you actually enter the intersection above say 10 mph? That would serve both deterrence and fairness.[/quote]
Because they don’t have to, they have you by the balls and they know it. It has nothing to do with fairness or deterrence, purely a revenue generator. The only reason they are allowed to be put in place is that there are enough mush brains out there to buy the line that it improves safety enough to be worth it.