How do some emergency vehicles get a light to change in their favor?
Some signalized intersections posses Emergency Vehicle Preemption receivers, mounted to the top of some signal poles. These devices allow for a disruption in the signal cycle for an emergency vehicle, reducing its travel time and protecting motorists from collisions. Vehicles with this capability are equipped with an emitter, which communicates with an intersection’s receiver. The receiver, when prompted, induces a light to change in favor of the emergency vehicle’s direction.
