Performance Analysis of Roundabouts under Mixed Traffic Flow Conditions

Author(s):

Chandrakant Patel , G. H. Raisoni College of Engineering, Nagpur; Dr. B.V.Khode, G. H. Raisoni College of Engineering, Nagpur

Keywords:

Roundabout; Critical headway; Follow-up headway; Entry Capacity; Delay; Degree of saturation; LOS

Abstract:

The capacity of the roundabout mainly depends on the flow at different entry legs approaching the roundabout. The critical gap is a crucial input parameter which mainly gives the idea about the gap acceptability behavior of vehicle’s driver. The performance of roundabout or rotary intersection in terms of queue lengths, avg. control delays and degree of saturation typically depends on entry capacity. Two roundabout intersections with different geometric characteristics are taken up for performance analysis. Different modes of transportation pass through these junctions. These roundabout intersections are working under mixed traffic flow conditions. All approach entry capacity has been analyzed for both roundabouts at their entry legs. Entry capacity verses circulating flow relationship have been developed & entry capacities evaluated by different models are compared in this paper which shows the behavior and variations of each entry capacity models in our condition. This paper deals with the performance of roundabouts which is based on various parameters such as critical headway, follow-up headway, entry (approach) capacity, circulating traffic, and average control delay. Capacity analysis results indicate that most of the approaches of Medical Square roundabout has greater than 0.85 degree of saturation and these approaches are critical for traffic flow & all entry approaches of Krida Square roundabout has degree of saturation under 0.85.

Other Details:

Manuscript Id	:	IJSTEV2I10321
Published in	:	Volume : 2, Issue : 10
Publication Date	:	01/05/2016
Page(s)	:	979-988

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