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Traffic signal controllers are electronic devices located at intersections that control the sequence of the lights. Along with computers, communications equipment, and detectors to count and measure traffic, the controllers are frequently grouped together to control large numbers of traffic signals, either at intersections in a city or on ramps approaching expressways and motorways. While the detailed brand and type of equipment vary greatly, the functions performed by the systems are generally consistent. There are four basic elements in a computerized traffic control system: computer(s), communications devices, traffic signals and associated equipment, and detectors for sensing vehicles. Traffic flow information ...(100 of 9775 words)