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.
Get full access to this article
View all available purchase options and get full access to this article.
References
Akçelik, R. (2005). “Roundabout model calibration issues and a case study.” Proc., TRB National Roundabout Conf., Transportation Research Board, Vail, Colo.
Brilon, W. (2005). “Roundabouts: A state of the art in Germany.” Proc., TRB National Roundabout Conf., Transportation Research Board, Vail, Colo.
Brilon, W., and Wu, N. (2006). Merkblatt für die Anlage von Kreisverkehren [Guideline for the design of roundabouts], FGSV Verlag Gmbh, Cologne, Germany.
CROW. (1998). “Eenheid in rotondes [Uniformity in roundabouts].” Rep. No. 126, CROW, Ede, The Netherlands (in Dutch).
CROW. (2008). “Turborotondes [Turboroundabouts].” Rep. No. 257, CROW, Ede, The Netherlands (in Dutch).
Fortuijn, L. G. H. (2009a). “Turbo roundabouts: Design principles and safety performance.” Proc., TRB 88th Annual Meeting (CD-ROM), TRB, National Research Council, Washington, D.C.
Fortuijn, L. G. H. (2009b). “Turbo roundabouts: Estimation of capacity.” Proc., TRB 88th Annual Meeting (CD-ROM), TRB, National Research Council, Washington, D.C.
Fortuijn, L. G. H., and Harte, V. F. (1997). “Multi-lane roundabouts: Exploring new models.” Proc., Traffic Engineering Working Days, CROW, Ede, The Netherlands.
Mauro, R., and Branco, F. (2009). “Comparative traffic operational analysis between turboroundabouts and roundabouts.” Proc., TRB 88th Annual Meeting (CD-ROM), TRB, National Research Council, Washington, D.C.
Tollazzi, T., Toplak, S., and Jovanović, G. (2006). Ocena kapacitete turbo krožnega križišča [The first capacity estimation of a turbo-roundabout in Slovenian circumstances], Gradbeni Vestnik, Slovenian Society of Engineers (in Slovenian).
Tracz, M. (2005). “Roundabouts use in Poland and developments in their design—Country report.” Proc., 3rd Int. Symp. on Highway Geometric Design, TRB, National Research Council, Chicago.
Transportation Research Board. (2000). Highway capacity manual, Transportation Research Board, Washington, D.C.
Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 136 • Issue 4 • April 2010
Pages: 316 - 322
Copyright
© 2010 ASCE.
History
Received: Mar 30, 2009
Accepted: Sep 14, 2009
Published online: Sep 18, 2009
Published in print: Apr 2010
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.