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This type of device is true. My city has it.
About 4 years ago I had a client who worked for the fire department. I noticed that some of our traffic lights had some type of sensor.
I thought back then it was for speed.
He drove his fire truck to my office and showed me a flashing strobe light on the front bumper, that changed the light to green. The traffic light has to have a sensor or the strobe light will do nothing.
The strobe light points up to the sky.
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