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ground traffic signal light

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  • Traffic Control — ➡ law enforcement * * * Introduction       supervision of the movement of people, goods, or vehicles to ensure efficiency and safety.       Traffic is the movement of people and goods from one location to another. The movement typically occurs… …   Universalium

  • Light rail — For specific light rail systems, many of which use the words light rail as part of their name, see List of tram and light rail transit systems. Edmonton Light Rail Transit in Edmonton, Alberta, Canada …   Wikipedia

  • Traffic enforcement camera — Gatso speed camera A traffic enforcement camera (also red light camera, road safety camera, road rule camera, photo radar, photo enforcement, speed camera, Gatso) is an automated ticketing machine. It may include a camera which may be mounted… …   Wikipedia

  • Light-emitting diode — LED redirects here. For other uses, see LED (disambiguation). Light emitting diode Red, pure green and blue LEDs of the 5mm diffused type Type Passive, optoelectronic Working principle Electr …   Wikipedia

  • Light rail in North America — The term light rail was coined in 1972 by the U.S. Urban Mass Transit Association (UMTA) to describe new streetcar transformations which were taking place in Europe and the United States. The Germans used the term stadtbahn to describe the… …   Wikipedia

  • Light rail in the United States — The use of light rail in the United States is low by European standards. According to the American Public Transportation Authority, of the 20 odd light rail systems in the United States only five (Boston, San Francisco, Los Angeles, San Diego and …   Wikipedia

  • Signal Corps (United States Army) — U.S. Army Signal Corps Coat of Arms Active 3 March 1863 – Present Country …   Wikipedia

  • Railway signal — Not to be confused with Railway signalling. A signal is a mechanical or electrical device erected beside a railway line to pass information relating to the state of the line ahead to train/engine drivers. The driver interprets the signal s… …   Wikipedia

  • East Kent Light Railway — The East Kent Light Railway was part of the Colonel Stephens group of cheaply built rural light railways in England. Holman Fred Stephens was engineer from its inception, subsequently becoming director and manager. The line ran from Shepherdswell …   Wikipedia

  • Air traffic control radar beacon system — The air traffic control radar beacon system (ATCRBS) is a system used in air traffic control (ATC) to enhance radar monitoring and separation of air traffic. ATCRBS assists ATC radars by acquiring information about the aircraft being monitored,… …   Wikipedia

  • Aviation light signals — In the case of a radio failure or aircraft not equipped with a radio, air traffic control may use a signal lamp to direct the aircraft. The signal lamp has a focused bright beam and is capable of emitting three different colors: red, white and… …   Wikipedia

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