Quote:
Originally Posted by arsenal
I think that's how they determine the whole running a red light thing. Pads under the road, triggered when a car drives over it (in this case rolls), while the light is red. It then sends a signal to camera to take a picture.
At least that's what CSI told me.
I am sure you can find the real solution somewhere on the interweb.
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That makes sense, since whenever I have seen it the case is a car rolling closer to the crosswalk, past the marked stop line at that intersection.