A Dallas TV station timed yellow lights at intersections with red light cameras and found something interesting (via TheNewspaper.com):
The city’s second highest revenue producing camera, for example, is located at the intersection of Greenville Avenue and Mockingbird Lane. It issued 9407 tickets worth $705,525 between January 1 and August 31, 2007. At the intersections on Greenville Avenue leadding up to the camera intersection, however, yellows are at least 3.5 or 4.0 seconds in duration, but the ticket producing intersection’s yellow stands at just 3.15 seconds. The yellow is .35 seconds shorter than TxDOT’s recommended bare minimum.
“For 30 miles per hour, if your yellow time was less than three and a half, you would not be giving that driver enough time to react and brake and stop prior to getting to the intersection,” TxDOT Dallas District office transportation engineer supervisor Chris Blain told KDFW.
Sounds like shenanigans! Too bad Dallas doesn’t have a Mayor White to guard against such things.
A small change in signal timing can have a great effect on the number of tickets issued. About four out of every five red light camera citations are issued before even a second has elapsed after the light changed to red, according to a report by the California State Auditor. This suggests that most citations are issued to those surprised by a quick-changing signal light.
[snip]
Dallas likewise installed the cameras at locations with existing short yellow times. A total of twenty-one camera intersections in Dallas have yellow times below TxDOT’s bare minimum recommended amount. The Texas Transportation Institute study also found that shorter yellows generate a 110 percent jump in the number of tickets, but at the cost of safety. Increasing the yellow one second above the recommended minimum cut crashes by 40 percent.
Maybe one day one of our local news outlets will undertake a yellow-light timing investigation, just to make sure Houston is shenanigan-free.
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