Your Questions About Make Traffic Lights Change

Linda asks…What is the device used to make the traffic lights change when an emergency vehicle is approaching? ?Like when that little white light turns on at the intersection and the light turns green to allow the emergency vehicle thru.. I think I saw something on CSI called a LTM or LTR transmitter. I can't find anything out about it.. I need this for research i school please help!!Barry answers:It is a preemptor, but the name depends on who the manufacturer is. For example, the

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