Comparative Analysis of Compact Multilane Roundabouts and Turbo-Roundabouts
Publication: Journal of Transportation Engineering
Volume 136, Issue 4
Abstract
This paper presents a comparative analysis of the traffic performances of turbo-roundabouts and roundabouts in terms of capacity and delays. We chose to use a recent German procedure for roundabouts included in “Kreisel” software as our calculation procedure to determine the capacity of turbo-roundabouts. We found that the capacities of turbo-roundabout secondary entries were higher than roundabout capacities when the traffic flow in the inner lane of the circle is high and the traffic flow in the outer lane of the circle is in the low to lower-middle range. On the contrary, the capacities of the main entries to roundabouts are always higher than the capacities of the main entries to turbo-roundabouts. Taking into account the arithmetic or weighted mean behavior of the four entries, the total capacities of turbo-roundabouts, at both saturated and undersaturated conditions, are, in most cases, higher than the total capacities of roundabouts. In most of the important practical situations analyzed, delays were slightly shorter for turbo-roundabouts than for roundabouts, especially for high traffic flows in the circle lanes.
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© 2010 ASCE.
History
Received: Mar 30, 2009
Accepted: Sep 14, 2009
Published online: Sep 18, 2009
Published in print: Apr 2010
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