Emergency vehicle lights
Emergency vehicles such as fire engines, ambulances, police cars, snow-removal vehicles and tow trucks are usually equipped with intense warning lights of particular colours. These may be motorised rotating beacons, xenon strobes, or arrays of LEDs. The prescribed colours differ by jurisdiction; in most countries, blue and/or red special warning lamps are used on police, fire, and medical-emergency vehicles. In North America and some other jurisdictions, amber lights are for tow trucks, private security personnel, and other nonofficial special-service vehicles, while volunteer firefighters use red, blue, or green, depending on jurisdiction. In the UK, doctors may use green warning lamps. Special warning lights, usually amber, are also sometimes mounted on slow vehicles such as mobile cranes, excavators, tractors, and even mobility scooters in certain conditions.