Not too sure. But not too far from the intersection.They work your speed out from two pictures. You'll know cause its like a road train with mega fog lights high beaming you twice. First image is a pic of you crossing the first initial sensor. about a 1-1.5 second gap for the second image which should catch you in the act doing whatever you shouldnt be. From those two images they work out your speed.
If they have an image of you running the red light, and your going so fast not in the second image. The sensor on the other side of the road will get you.
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