Rotary Intersections

Posted by Yudha Aditya | 9:53 PM | | 4 comments »

A rotary intersection or traffic rotary is an enlarged road intersection where all converging vehicles are forced to move round a large central island in one direction (clock wise direction) before they can weave out of traffic flow into their respective directions radiating from the central island. The main objects of providing a rotary are to eliminate the necessity of stopping even for crossing streams for vehicles and to reduce the area of conflict. The crossing of vehicles is avoided by allowing all vehicles to merge into the stream around the rotary and then to diverge out to the desired radiating road. Thus the crossing conflict is eliminated and converted into weaving manoeuvre or a merging operation from the right and a diverging operation to the left.

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Various design factors to be considered in a traffic rotary are:
  • Speed
  • Shape of central island
  • Radius of rotary roadway
  • Weaving angle
  • Weaving distance
  • Width of rotary roadway
  • Radius of entrance and exit curves
  • Channelizing islands
  • Camber and superelevation
  • Grade
  • Lighting and signs

Highway and Transport Engineering
and this section is about Rotary Intersections
(refference : Khanna, S.K., Justo, C.E.G., Highway Engineering, 3th edition, Nem Chand & Bros Roorkee (U.P.), 1976.)

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Title Post: Rotary Intersections
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