also before in front of me and when the cars start moving it starts taking photos. I guess that it is starts taking photos when you start moving until the traffic lights change into red so it can capture anyone who will cross it. Guess that the principle is: Taking all photos of the guilty and none guilty, filter those later and fine that guilty ones :)

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Do not dwell in the past, do not dream of the future, concentrate the mind on the present moment. (Gautama Buddha)