What are the lights placed above traffic signals?
NEXSTAR) – On many traffic signals found throughout the United States, there is a small light that is placed in between or off to the side of the traffic signal lights. Sometimes you see them blink when emergency vehicles are passing through./ These are called priority or preemption signals. The lights are part of a system that allows the operator of a vehicle to override the normal operation of a traffic light. Maricopa County, Arizona, Emergency Vehicle Preemption (EVP) systems were first installed in the in hopes that they would reduce ...
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