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    Traffic Signal Design: How to


    how to design a traffic signal

    Flow of traffic on a highway is normally controlled or regulated at a junction for effective and smooth movement of traffic. A Traffic signal device is a device used to regulate the flow of traffic on a highway. It either tells a vehicle to stop or move in order to permit smooth flow of traffic.
    There are two types of signal devices:
    1.  Pre-timed traffic controller
    2.  Traffic actuated controller
    For a pre-timed traffic controller, timing is pre-calculated or pre-calibrated, and does not take into account the situation of traffic on the highway.
    For a traffic actuated controller, the traffic or vehicles plying the road activate or actuate the device by stepping on the sensor.
            A traffic signal device could be fully or partially actuated. It is fully actuated when installed at all the legs meeting at the junction. When some of the legs are left out in the implementation, it is said to be partially actuated. The total length of time between the different colours of the traffic control device is known as cycle length, while the different timings between the colours is known as splits. The total number of vehicles at the beginning of the green coloration is known as vehicular queue length.
    Warrants for installation of traffic signal
    1.  Minimum vehicular volume.
    2.  Interruption of continuous flow.
    3.  Minimum pedestrian volume.
    4.  A situation where you have a school crossing.
    5.  Progressive movement.
    6.  Accident experience.
    7.  Systems consideration.
    8.  Combination of warrants.

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