The different types of traffic island are as follow:

(1) Rotary or central islands: A traffic island constructed in the centre of an intersection to compel movement of traffic in a clock-wise direction is called rotary or central island. They are constructed at the centre of road intersection to eliminate points of direct conflict and to provide an orderly and organized traffic flow. They are provided only when sufficient area for their construction is available at the road intersection. Their shape depends upon the type of road intersection. Rotary islands are usually of the following shapes:

(i) Circular rotary island.

(ii) Squarish with rounded edge rotary island.

(iii) Elliptical, elongated or oval shaped rotary island.

(iv) Rectangular shaped rotary island.

(2) Channelising islands: The traffic islands provided at the entries and exist of traffic rotary are called Channelising or refuge islands. The shape of a Channelising island depends on actual conditions existing at each site of road intersection. A few typical designs of Channelising islands are illustrated below: