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all of the stop lights I've seen have a coil of wire in the pavement, or a plate with a coil under it, they are a big simple metal detector.
I live in a state that only requires motorcycles and bicycles to stop at a stop light for 45 seconds (the amount of time that they are supposed to stay red of there is a car waiting), and after that amount of time you can treat it like a stop sign and proceed if it's clear.
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