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  2. Non-detection at traffic lights in the United States - Wikipedia

    en.wikipedia.org/wiki/Non-detection_at_traffic...

    Traffic lights that do not service traffic due to non-detection may not meet the federal legal definition adopted by most states for a traffic control signal, which is any device "by which traffic is alternately directed to stop and permitted to proceed". [1][2][3] Meeting this definition is required for any citation to be upheld; traffic ...

  3. Variations in traffic light operation - Wikipedia

    en.wikipedia.org/wiki/Variations_in_traffic...

    The small light at the top tells the driver when the vehicle's transponder signal is received by the traffic light. In traffic engineering, there are regional and national variations in traffic light operation. This may be in the standard traffic light sequence (such as the inclusion of a red-amber phase) or by the use of special signals (such ...

  4. Traffic light - Wikipedia

    en.wikipedia.org/wiki/Traffic_light

    Traffic lights control flows of traffic using social norms and legal rules. In most jurisdictions, it is against the law to disobey traffic signals and the police, or devices such as red light cameras, can issue fines or other penalties – and in some cases prosecute – drivers who break those laws. [ 71 ]

  5. Emergency vehicle lighting - Wikipedia

    en.wikipedia.org/wiki/Emergency_vehicle_lighting

    In Memphis, Tennessee, Minneapolis, Minnesota and Saint Paul, Minnesota most city maintenance vehicles (including MLG&W utility trucks) with flashing lights use yellow lights; however, some vehicles with the traffic engineering department use red flashing lights, especially vehicles equipped with cherry pickers used to repair traffic signals.

  6. Traffic light control and coordination - Wikipedia

    en.wikipedia.org/wiki/Traffic_light_control_and...

    Traffic light control and coordination. A junction for road vehicles and pedestrians controlled by traffic lights in the UK. The various vehicle and pedestrian movements are separated in either time or space for safety and efficiency. The normal function of traffic lights requires more than sight control and coordination to ensure that traffic ...

  7. History of traffic lights - Wikipedia

    en.wikipedia.org/wiki/History_of_traffic_lights

    The history of traffic lights is associated with the historic growth of the automobile. [1] Traffic lights were first introduced in December 1868 on Parliament Square in London to reduce the need for police officers to control traffic. [2] Since then, electricity and computerised control has advanced traffic light technology and increased ...

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