Explain with sketch: i) Rotary island ii) Channelizing island

Explain with sketch: i) Rotary island ii) Channelizing island
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a) Rotary Island: A traffic island constructed in the center of an intersection to force the movement of traffic in the clockwise direction is called Rotary Island. They are constructed at the center of road intersection to eliminate points of direct conflict and to provide orderly organized traffic flow. They are provided only when sufficient area of construction is available. They are usually of circular, square, rectangular and elliptical shape. 

b) Channelizing Island: Traffic islands provided at the entries and exits of a traffic rotary are called channelizing islands. It is used to guide the traffic into proper channels through the intersection area. It is useful as a traffic control device for intersection at grade when the area is large. Size and shape of channelizing island will very much depend upon the layout and dimensions of the intersection.

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