This creates rotating beams of light, appearing to flash when viewed. These revolving lights may contain a single, stationary bulb around which a curved mirror is spun (or which is attached to a spinning mirror), or a lamp with a Fresnel lens. Bottom left and right The green dome of the beacon has been removed to show its rotating reflector, stationary incandescent lamp, and electric motor. Center The beacon, with the mirror removed. The parts and workings of a rotating light: Top The assembled beacon, including an optional mirror to be used when the beacon is placed in the windshield or rear window. For example, California Vehicle Code Section 25252 states: "Every authorized emergency vehicle shall be equipped with at least one steady burning red warning lamp visible from at least 1,000 feet to the front of the vehicle." In the latter case, steadily burning lights are often used alongside rotating or flashing lights rather than on their own, though historically some emergency vehicles only displayed steadily burning lights. These may be white lights used on scene to enable emergency workers to see what they are doing, or they may be colored lights that advertise the emergency vehicle's presence. The simplest form of lighting is a steadily burning lamp. The optical and mechanical characteristics of the lights ( Light-emitting diode) used can have a significant effect on the look of the vehicle and how readily it gains attention in emergencies. It has yet to be determined whether autonomous vehicles will be required to carry lights, or what colors or patterns they might exhibit to warn off aggressive human drivers. Most private security agencies have special permits that allow them to use beacons in specific areas. The use of emergency beacons is restricted by law in many jurisdictions only for responding to an emergency, initiating a traffic stop, bona fide training exercises, or when a specific hazard exists in the road. Some vehicles incorporate a small arrow board to direct traffic. It may also be used to provide specific directions to motorists, such as a command to pull over. Due to the scattering properties of the blue color, it is only visible to lower altitudes and is therefore less easily spotted by enemy airplanes.Įmergency vehicle lighting is generally used to clear the right of way for emergency vehicles, or to warn approaching motorists of potential hazards, such as a vehicle that is stopped or moving slower than the rate of traffic, or a car that has been pulled over. As a result of the ‘Verdunkelung’, a black-out measure for aerial defense from 1935, cobalt blue was regulated to replace the red color used until 1938 in emergency vehicle lights. The use of the blue emergency light originates in Germany during World War II. Research into the usefulness and potential dangers of these lights is also presented.Įmergency vehicle lighting is a sub-type of emergency vehicle equipment. These non-and semi-emergency lights are also discussed here. tow trucks) may be permitted to use similar lights. school buses) and semi-emergency vehicles (e.g. Laws regarding and restricting the use of these lights vary widely among jurisdictions, and in some areas non-emergency vehicles (e.g. In many jurisdictions, the use of these lights may afford the user specific legal powers, and may place requirements on other road users to behave differently, such as compelling them to pull to the side of the road and yield right of way so the emergency vehicle may proceed through unimpeded. Often, they are used along with a siren (or occasionally sirens) in order to increase their effectiveness. These lights may be dedicated emergency lights, such as a beacon or a light bar, or may be modified stock lighting, such as a wig-wag or hide-away light, and are additional to any standard lighting on the car such as hazard lights. ( September 2022) ( Learn how and when to remove this template message)Įmergency vehicle lighting is one or more visual warning lights fitted to a vehicle for use when the driver wishes to convey to other road users the urgency of their journey, to provide additional warning of a hazard when stationary, or in the case of law enforcement as a means of signalling another driver to stop for interaction with an officer. Several templates and tools are available to assist in formatting, such as Reflinks ( documentation), reFill ( documentation) and Citation bot ( documentation). Please consider converting them to full citations to ensure the article remains verifiable and maintains a consistent citation style. This article uses bare URLs, which are uninformative and vulnerable to link rot.
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