Abstract
Based on field data collected at nine roundabouts in Gold Coast, Australia, this paper evaluates the performance of the capacity estimation for single-lane roundabouts using analytical models [including the highway capacity manual (HCM) 2000 model, the German Highway Capacity Manual (GHCM) model, the signalized and unsignalized intersection design and research aid (SIDRA) model and a new roundabout capacity (NRC) model] and an empirical model (the HCM 2010 model). First, this study calibrates critical gaps, follow-up times, and conflicting flows. Compared with the capacities measured in the field, the authors carry out a study to analyze the accuracy of the HCM, GHCM, SIDRA, and NRC models. The results show that the five models underestimate capacity but the NRC model produces a smaller range of relative error ( to ) and root-mean-square deviation (47.68) than the HCM 2010 ( to and 105.00, respectively), HCM 2000 ( to and 115.29, respectively), GHCM ( to and 146.82, respectively), and SIDRA ( to and 113.48, respectively) models. Accordingly, the NRC outperforms the other four models for the surveyed roundabouts. The five models estimate a similar capacity in low and medium traffic volumes, and exiting vehicles play an important role in high traffic volumes, and at high traffic condition exiting vehicles warrant more entry opportunities that exceeds the impact of high circulating volumes on entry capacity.
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Acknowledgments
This research is supported by a Discovery Research grant and a Discovery Accelerator Supplement from the Natural Sciences and Engineering Research Council of Canada (No. 151527269). The authors are grateful to anonymous reviewers for their most helpful comments.
References
Akcelik, R. (1994). “Gap acceptance modelling by traffic signal analogy.” Traffic Eng. Control, 35(9), 498–506.
Al-Ghandour, M., Rasdorf, W., Williams, B., and Schroeder, B. (2011). “Analysis of single-lane roundabout slip lanes using SIDRA.” Transportation and Development Institute Congress 2011, ASCE, Reston, VA, 1235–1244.
Bared, J., and Edara, P. K. (2005). “Simulated capacity of roundabouts and impact of roundabout within a progresses signalized road.” Proc., National Roundabout Conf., Transportation Research Board of the National Academies, Vail, CO.
Bie, J., Lo, H. K., and Wong, S. C. (2008). “Circulatory markings at double-lane traffic roundabout.” J. Transp. Eng., 378–388.
Bie, J., Lo, H. K., and Wong, S. C. (2010). “Capacity evaluation of multi-lane traffic roundabouts.” J. Adv. Transp., 44(4), 245–255.
Brilon, W. (2005). “Roundabouts: A state of the art in Germany.” Proc., National Roundabout Conf., Transportation Research Board of the National Academies, Vail, CO.
Dahl, J., and Lee, C. (2012). “Empirical estimation of capacity for roundabouts using adjusted gap-acceptance parameters for trucks.” J. Transp. Res. Board, 2312, 34–45.
Diah, J. M., Rahman, M. Y. A., Adnan, M. A., and Khoo, H. L. (2011). “Modeling the relationship between geometric designs and weaving section flow process of conventional roundabouts.” J. Transp. Eng., 980–986 .
Dixit, V. V. (2012). “Modeling origin-destination effects on roundabout operations and inflow control.” J. Transp. Eng., 1016–1022.
Flannery, A. (2001). “Geometric design and safety aspects of roundabouts.” J. Transp. Res. Board, 1751(09), 34–45.
Flannery, A., and Datta, T. (1997). “Operational performance measures of American roundabouts.” J. Transp. Res. Board, 1572, 68–75.
Hellinga, B., and Sindi, A. (2012). “Analytical method for estimating delays to vehicles traversing single-lane roundabouts as a function of vehicle and pedestrian volumes.” J. Transp. Res. Board, 2312(06), 56–66.
Hoglund, P. G. (1994). “Alternative intersection design—A possible way of reducing air pollutant emissions from road and street traffic.” Sci. Total Environ., 147, 35–44.
Kang, N., Nakamura, H., and Asano, M. (2014). “Estimation of roundabout entry capacity under the impact of pedestrians by applying microscopic simulation.” J. Transp. Res. Board, 2461, 113–120.
Kimber, R. M. (1980). “The traffic capacity of roundabouts.”, Transport and Road Research Laboratory, Crowthorne, U.K.
Kimber, R. M., and Semmens, M. C. (1977). “A track experiment on the entry capacities of offside priority roundabouts.” SR334, Transport and Road Research Laboratory, Crowthorne, U.K.
Lee, C. (2015). “Developing passenger-car equivalents for heavy vehicles in entry flow at roundabouts.” J. Transp. Eng., 04015013.
Lee, C., and Khan, M. (2013). “Prediction of capacity for roundabouts based on percentages of trucks in entry and circulating flows.” J. Transp. Res. Board, 2389, 30–41.
Lochrane, T., Kronprasert, N., Bared, J., Dailey, D., and Zhang, W. (2014). “Determination of mini-roundabout capacity in the United States.” J. Transp. Eng., 04014051.
Mauro, R., and Branco, F. (2010). “Comparative analysis of compact multilane roundabouts and turbo-roundabouts.” J. Transp. Eng., 316–322.
Mereszczak, Y., Dixon, M., Kyte, M., Rodegerdts, L., and Blogg, M. (2006). “Including exiting vehicles in capacity estimation at single-lane U.S. roundabouts.” J. Transp. Res. Board, 1988, 23–30.
Monache, M. L. D., Obsu, L. L., and Kassa, S. M. (2014). “Traffic flow optimization on roundabouts.” Procedia Social Behav. Sci., 111, 127–136.
Munawar, A., and Haryanto, S. (2010). “Optimizing signalized roundabout by computer simulation (case study: Pelem Gurih roundabout, Yogyakarta).” Traffic and transportation studies 2010, ASCE, Reston, VA, 357–364.
Mussone, L., Matteucci, M., Bassani, M., and Rizzi, D. (2013). “An innovative method for the analysis of vehicle movements in roundabouts based on image processing.” J. Adv. Transp., 47(6), 581–594.
Pinna, F., and Piras, C. (2011). “Non-standard roundabouts: Analysis of problems.” Transportation and Development Institute Congress, 1255–1265.
Polus, A., Lazar, S. S., and Livneh, M. (2003). “Critical gap as a function of waiting time in determining roundabout capacity.” J. Transp. Eng., 504–509.
Qu, X., Ren, L., Wang, S., and Oh, E. (2014). “Estimation of entry capacity for single-lane modern roundabouts: Case study in Queensland, Australia.” J. Transp. Eng., 05014002.
Sarker, B., and Baylot, E. (2012). “Throughput capacity estimation for convoy movement in linked roads.” J. Transp. Eng., 1133–1142.
SIDRA Intersection 6.0 [Computer software]. Akcelik & Associates, Greythorn, Australia.
Transportation Research Board. (2000). “Highway capacity manual.” National Research Council, Washington, DC.
Transportation Research Board. (2010). “Highway capacity manual.” National Research Council, Washington, DC.
Troutbeck, R. J. (1989). “Evaluating the performance of a roundabout.” SR 45, Australian Road Research Board, Vermont South, Australia.
Troutbeck, R. J. (1992). “Estimating the critical acceptance gap from traffic movements.”, Physical Infrastructure Centre, Queensland Univ. Technology, Brisbane, Australia.
Valdez, M., Cheu, R., and Duran, C. (2011). “Operations of modern roundabout with unbalanced approach volumes.” J. Transp. Res. Board, 2265, 234–243.
Wei, T., and Grenard, J. (2012). “Calibration and validation of highway capacity manual 2010 capacity model for single-Lane roundabouts.” J. Transp. Res. Board, 2286, 105–110.
Wei, T., Grenard, J., and Shah, H. (2011). “Developing capacity models for local roundabouts.” J. Transp. Res. Board, 2257, 1–9.
Wong, S. C. (1996). “On the reserve capacities of priority junctions and roundabouts.” Transp. Res. Part B, 30(6), 441–453.
Wong, S. C., Sze, N. N., Loo, B. P. Y., and Chow, A. S. Y. (2012). “Performance evaluations of spiral-marking roundabouts in Hong Kong.” J. Transp. Eng., 1377–1387.
Wu, N. (2012). “Equilibrium of probabilities of estimating distribution function of critical gaps at unsignalized intersections.” J. Transp. Res. Board, 2286(6), 49–55.
Yap, Y., H. M., Gibson, B. J., Waterson (2015). “Models of roundabout lane capacity.” J. Transp. Eng., 04015007.
Yap, Y. H., Gibson, H. M., and Waterson, B. J. (2013). “An international review of roundabout capacity modelling.” Transp. Rev., 33(5), 593–616.
Yin, D., and Qiu, T. (2011). “Comparison of macroscopic and microscopic simulation models in modern roundabouts analysis.” J. Transp. Res. Board, 2265, 244–252.
Yousif, S., Alterawi, M., and Henson, R. (2013). “Effect of road narrowing on junction capacity using microsimulation.” J. Transp. Eng., 574–584.
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Published In
Journal of Transportation Engineering
Volume 142 • Issue 12 • December 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jan 27, 2015
Accepted: Mar 28, 2016
Published online: Aug 3, 2016
Published in print: Dec 1, 2016
Discussion open until: Jan 3, 2017
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