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Hackaday
7y
Intro To The North American Traffic Signal
most traffic signal controls started out as purely electromechanical devices. Cabinets were chock full of synchronous motors turning timing wheels with cams to cycle the intersection’s lights ...
Austin Daily Herald
5d
Ask a Trooper: Light holds three functions
I’m wondering about a light that seems to only be on at night on the traffic lights. It’s a small purple or blueish light ...
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