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Yellow/amber (not including traffic advisor lights) is for security cars, semi-trucks with big and long trailers, tow trucks, road or highway maintenance/authority vehicles (with optional red lights), some military vehicles, airport service vehicles (excluding airport emergency services), a limited amount of hearse vans, emergency response team ...
Traffic signal preemption (also called traffic signal prioritisation) is a system that allows an operator to override the normal operation of traffic lights.The most common use of these systems manipulates traffic signals in the path of an emergency vehicle, halting conflicting traffic and allowing the emergency vehicle right-of-way, thereby reducing response times and enhancing traffic safety.
An ambulance with two red revolving lights mounted above two flashing red lights, with two speakers between for the vehicle's electronic siren.Also seen are two antennae; the one seen between the two speakers is for a two-way radio, while the one seen in front of the flashing light on the left is probably for the vehicle's conventional AM/FM radio.
Air traffic control signal light gun in use at base flight tower. In the case of a radio failure or aircraft not equipped with a radio, or in the case of a deaf pilot, air traffic control may use a signal lamp (called a "signal light gun" or "light gun" by the FAA [1] [2]) to direct the aircraft.
They operate as an additional layer of safety, independent of human-issued air traffic control clearances. [ 1 ] The system works by processing traffic position and movement data generated by transponders aboard aircraft and airside ground-vehicles such as aircraft rescue and firefighting (ARFF) units , aircraft tugs , and snow-clearing equipment .
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