Red light camera, a good tool? or profit machine?

The problem is that there is lots of evidence that the companies that run these red light cameras will not install them on lights that have an adequate yellow time. For example:

http://arstechnica.com/gadgets/news/...onal-trend.ars


And in one case the company was altering the yellow times to trap more motorists:

http://arstechnica.com/tech-policy/n...low-lights.ars