Not to cause problems but this is interesting article about red light camera.
<a href="http://arstechnica.com/news.ars/post/20080413-red-light-camera-monkey-business-may-be-a-national-trend.html">http://arstechnica.com/news.ars/post/20080413-red-light-camera-monkey-business-may-be-a-national-trend.html</a>
"In the single court case that has occurred thus far, Chattanooga's city traffic engineer John Van Winkle testified that the yellow signal light should be (and was) turned on for the 3.9 seconds necessary to meet basic safety standards. The judge in question ordered the claim verified, and discovered that the light was only set for three seconds?significantly less than the 3.9-second minimum. Van Winkle claims that the problem was caused by an accidental mixup with turn arrow timing, but there might be more behind the issue. According to confidental documents released in 2001, Lasercraft, the company behind Chattanooga's red camera lights, only installs red light cameras at high-volume intersections with an "amber phase" of less than four seconds.
None of the other cities are facing court actions, but investigative reports have turned up troublesome trends. In Dallas, yellow lights at the city's revenue generators camera-enforced intersections were timed for just 3.15 seconds, or 0.35 seconds less than the Texas Department of Transportation minimum. In this case, a third of a second may make a substantial difference in revenue?theNewspaper reports that most (80 percent) red-light tickets are issued less than one second after the light has turned to red. Ironically, Dallas is now considering scrapping its ticket revenue program after new legislation forced the city to post signs alerting drivers to the existence of the cameras as well as requiring all towns to send 50 percent of their camera-derived income to the state's coffers. "