Was it ever actually about safety? The whole point of it seems to be just to create another revenue stream for thousands of corrupt local governments all across the country.
Still I do think many are in place only for revenue, much like speed limit cameras. I would rather see red light cameras than speed limit cameras, however I want the later to come only under specific circumstances with full public accounting. I think if they really want to sell us on safety it should all go to charity.
I know a couple of signals that are there to just make people slow down, and they work even if a lot of us know that there's no radar there.