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  2. Copilot Answer
     How and Why They Work
    How and Why They Work
    Who Really Invented Traffic Lights?
    Who Really Invented Traffic Lights?
    History

    The first system of traffic signals, which was a semaphore traffic signal, was installed as a way to replace police officer control of vehicular traffic outside the Houses of Parliament in London on 9 December 1868. This syste… See more

    Vehicular signals

    A set of lights, known as a signal head, may have one, two, three, or more aspects. The most common signal type has three aspects facing the oncoming traffic: red on top, amber (yellow) below, and green below that. Additi… See more

    Pedestrian signals

    Pedestrian signals are used to inform pedestrians when to cross a road. Most pedestrian signal heads will have two lights: a 'walk' light (normally a walking human figure, typically coloured green or white) and a 'don'… See more

    Cycle signals

    Where cycle lanes or cycle tracks exist on the approach to a signal-controlled junction, it must be considered how to incorporate cyclists safely into the junction to reduce conflict between motor vehicles and cyclists. … See more

     
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