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Depends on what you do with them. o Are they counting actual rates using the image to determine volume and rate of travel? o Not everyone has a mobile phone but everyone of concern has a car. If they are also used for monitoring violations, you have the false identity problem: the vehicle must be identified separately from identifying the driver at the time of violation. Or it's just bad taste. Purple??? :-) len -----Original Message----- From: Francis Norton [mailto:francis@r...] At the risk of getting off-topic, can anyone tell me why we have purple traffic cameras littering UK roads to provide traffic-flow news to mobile phone users, when you could simply monitor the flow of mobile phones from one road-phone cell to the next?
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