Schneier on Security

I have been told by someone who had previously worked for my city's public works department, that many of the red light cameras are non-functional. Basically the city put up a lot more of the weatherproof cases than they have cameras, and they periodically move the cameras from one intersection to another. The motion sensor and flash are part of the case, so they always act like they're functional, even if no picture is taken.

The upshot is, you have to assume that there's a camera in every case, and drive more carefully.

Sadly, Congress-requested NRC reports on science issues affecting public policy tend to have about one day of public exposure, followed by ritual entombment by the civil service. I can't remember a single one that had any impact at all. They are written to be ignored.