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Blue lights alone may be used to secure the site of an accident (or a standing emergency vehicle). Sometimes, columns of emergency or police vehicles use blue lights (without the two-tone horns) to make the column more visible to other vehicles. [39] Blue and yellow are the only colours of flashing lights legal for use on moving vehicles.
load lights, which are used by ambulances and other vehicles with cargo doors to light up the area around the cargo doors. alley lights, which are typically found mounted on the side of a police car or emergency vehicle's lightbar, for the purpose of illuminating areas to the side of the car, such as into an alley, or a scene at the side of the ...
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.
Courtesy lights should not be confused with emergency warning lights used in conjunction with audible warning systems for emergency vehicles such as police cars, fire apparatus, ambulances, etc, nor should they be confused with warning lights as used by tow trucks, snow plows, construction vehicles and school buses to increase awareness ...
The use of flashing lights and sirens is colloquially known as blues and twos, which refers to the blue lights and the two-tone siren once commonplace (although most sirens now use a range of tones). In the UK, only blue lights are used to denote emergency vehicles (although other colours may be used as sidelights, stop indicators, etc.).
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