It’s a traffic control system designed to give emergency vehicles the green light — literally. That device is called an Opticom™, made by Global Traffic Technologies (GTT).
Here’s how it works:
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Emergency vehicles are equipped with an emitter, which sends out a visible or infrared strobe signal.
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Traffic intersections have an Opticom receiver, mounted near the traffic lights.
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When the receiver detects the correct coded signal, it communicates with the traffic control cabinet to:
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Turn the light green for the approaching emergency vehicle.
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Turn red in all other directions (or sometimes all red in every direction, depending on configuration).
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Many intersections also include a confirmation indicator light (usually white):
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A solid white light means the emergency vehicle has control of the intersection.
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A flashing white light means cross-traffic vehicles do not have control.
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Some cities even equip snowplows or buses with these systems to help manage traffic flow.
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