Red-light cameras

are associated with increased crashes and that the timings at yellow lights are often set too short to increase tickets for red-light running.
http://www.ridelust.com/red-light-cameras-just-dont-work/
A 2001 paper by the Office of the Majority Leader of the U.S. House of Representatives reported that red-light cameras are “a hidden tax levied on motorists.”

Which futher backs up my April post http://justacarguy.blogspot.com/2008/04/six-us-cities-tamper-with-traffic.html