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Advantages and Limitations of Traffic Rotary

Posted by aditya | 8:21 AM |

Various advantages of rotary are follows:
  1. Crossing manoeuvre is converted into weaving or merging and diverging operations
  2. All traffic including those turning right or going straight across the rotary have equal opportunity as those turning left.
  3. The variable cost of operation of automobile is less in a traffic rotary than in a signalized intersection where the vehicles have to stop and proceed.
  4. There is no necessity of traffic police or signal to control the traffic as the traffic rotary could function by itself as a traffic controlled intersection and is the simplest of all controls.
  5. The possible number of accidents and the severity of accidents are quite low because of low relative speed.
  6. Rotaries can be constructed with advantage when the number of intersecting roads is between four and seven.
  7. The capacity of the rotary intersection is the highest of all other intersections at grade.


picture from : www.iowadot.gov

Various limitation of rotary are as listed bellow:
  1. Rotary requires comparatively a large area of land and so where space is limited and costly as in built up areas, the total cost may be very high.
  2. Where pedestrian traffic is large as in urban areas the rotary by itself cannot control the traffic and hence has to be supplemented by traffic police.
  3. In places where there is mixed traffic and large number of cylists and pedestrians, the design of rotary becomes too elaborate and operation and control of traffic also become complex.
  4. Where the angle of intersection of two roads is too acute or when there are more than seven intersecting roads, rotaries become trouble some.
  5. When the distance between intersections on an important highway is less, rotaries become trouble some.

Highway and Transport Engineering
and this section is about Advantages and Limitations of Traffic Rotary
(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: Advantages and Limitations of Traffic Rotary
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Author: aditya