As part of an investigative series on Cleveland's traffic cameras, News Channel 5 enlisted CWRU math professor Chris Butler to help prove whether a speeding ticket was issued to the wrong car. Dave Hatala was issued a ticket with a photograph showing a car overtaking him. Professor Butler measured the distance between markers in the photograph, and using the time, calculated the speed of the cars in the photograph. The court agreed that the other car, not Hatala's car, was the one speeding, so Hatala was not liable for the violation. See Motorists Prove Red-Light Cameras Don't Work, NewsNet5, Feb. 1, 2007.
Thanks to Dave Carlin for the tip.