Rotary intersection by ravindra c
- 2. It is a specialised form of at grate intersection laid out for movement of traffic in one direction round a central island.
- 3. ROTARY ELEMENTS : Diverging : The dividing of a single stream of traffic into separate streams Merging : The converging of separate streams of traffic into a signal stream Weaving : The combined movement of merging and diverging of traffic streams moving in the same general direction Weaving length : The length of a section of a rotary in which weaving occurs.
- 6. Guidelines For Selecting A Rotary Type Intersection : 1. Rotaries are most apt where volumes entering from different intersection legs are approximately equal 2. A rotary is most appropriate when the proportion of turning traffic is very high 3. Maximum 3000 veh per hour is max practical capacity of high type rotaries 4. A rotary is a good choice when there are more than four approaches to the junction 5. When the approach radius width are restricted rotaries are more desirable 6. Rotaries are not suitable for traffic carrying very low volume
- 8. Advantages of Rotary intersection : 1. Ordered and regimented traffic flow 2. Frequent stopping and starting are avoided 3. Traffic proceeds simultaneously and continuously 4. Weaving movement replace the usual angular movement 5. Turns can be made easy 6. Self governing Disadvantages : 1. Difficult for right taking 2. Requires more land 3. Travel troublesome 4. Requires many warning and directional signs for safety 5. Difficult for pedestrians 6. Difficult when intersection angle is too cute.