Because radar detectors can get you in trouble. You might end up with a ticket just for having one of those.
I have nothing to say about listing where cops hide, but I do understand the reason for listing where cameras are. No one is looking to run red lights – in fact, if you do run one the camera will not catch you. They only activate right after the light turns red (or so I’ve heard). It is possible to misjudge the yellow light, and some lights with cameras seem to have a shorter yellow. I would like to know where there is a robot waiting to catch me every time I make a mistake.
In the UK, they have speeding cameras. But the law requires that the camera be painted yellow (for easy visibility) and that the road be marked shortly before the camera (I guess they only catch unwitting tourists). The purpose is to slow people down, not to catch them. Here, the purpose is to catch them. A cop is expensive and makes mistakes. A robot is not and has a higher success ratio.
In a non-Big Brother society, it is nice to know that you can get away with making a mistake. But imagine if we had robots that caught your every infraction of the law – you would be scared to live. Suppose a tissue fell out of your pocket while you were rooting around for your keys – and a robot snapped a picture and mailed it to you with a ticket. Suppose this happened every time you jaywalked. Every time you turned your attention away from your toddler and he wandered 5 feet away from you. Etc, etc.
Bottom line – I am against the use of robots to keep people in line. And I am against the uber strict enforcement that means you can’t make a mistake.