Empirical capacity model for roundabouts under heterogeneous traffic flow conditions

Abstract It is crucial to measure the performance of existing roundabouts in terms of its ability to handle the present traffic scenario. The capacity of an entry flow is found to vary immensely with the changing geometrics of the roundabout. A meticulous study was conducted to gather data from roundabouts with varying geometry and traffic characteristics. A model was developed using empirical analysis based on five such geometric parameters, which proved to be significant for estimating the capacity. The parameters used in this equation had a multiplicative relation with the conflicting flow. Every geometric has been tested individually for its influence on capacity, keeping the flow conditions constant. The developed model satisfied the practicality when validated with the site data. A comparative study with some existing empirical models indicated that the capacities of roundabouts are underestimated/overestimated for Indian scenario.

[1]  Shing Chung Josh Wong,et al.  Capacity of Multi-Lane Roundabout: Methodology Based on Lane Utilization , 2006 .

[2]  In thIs.  HCM roundabout Capacity Methods and alternative Capacity Models , 2010 .

[3]  George F. List,et al.  Roundabouts in the United States , 2007 .

[4]  Hashem R Al-Masaeid,et al.  DEVELOPMENT OF A DELAY MODEL FOR ROUNDABOUTS IN JORDAN , 2004 .

[5]  Samuel Hammond,et al.  The effect of additional lane length on roundabout delay , 2014 .

[6]  Hans P. Lindenmann.  Capacity of Small Roundabouts with Two-Lane Entries , 2006 .

[7]  Nicole Leemann,et al.  Two-lane roundabouts , 2009 .

[8]  Francesco Pinna,et al.  Use of Kriging Technique to Study Roundabout Performance , 2011 .

[9]  P Bovy,et al.  GUIDE SUISSE DES GIRATOIRES , 1991 .

[10]  R. M. Kimber.  Gap-Acceptance and Empiricism in Capacity Prediction , 1989, Transp. Sci..

[11]  黒田 孝次,et al.  Highway Capacity Manual改訂の動向--テイラ-教授の講演より , 1984 .

[12]  H. M. N. Al-Madani,et al.  Capacity of Large Dual and Triple-Lanes Roundabouts During Heavy Demand Conditions , 2013 .

[13]  Raffaele Mauro,et al.  Calculation of Roundabouts , 2010 .

[14]  Muhammad Akram Adnan,et al.  Modeling the Relationship between Geometric Design and Weaving Section Flow Process of Conventional Roundabouts , 2011 .

[15]  Abishai Polus,et al.  Analysis and Evaluation of the Capacity of Roundabouts , 1997 .

[16]  Edward Chung,et al.  Roundabouts : capacity and performance analysis , 1998 .

[17]  B W Robinson,et al.  CAPACITY AND PERFORMANCE OF ROUNDABOUTS: A SUMMARY OF RECOMMENDATIONS IN THE FHWA ROUNDABOUT GUIDE , 2000 .

[18]  R M Kimber,et al.  THE TRAFFIC CAPACITY OF ROUNDABOUTS , 1980 .

[19]  Raffaele Mauro,et al.  Calculation of Roundabouts: Capacity, Waiting Phenomena and Reliability , 2010 .

[20]  Rahmi Akçelik.  A ROUNDABOUT CASE STUDY COMPARING CAPACITY ESTIMATES FROM ALTERNATIVE ANALYTICAL MODELS , 2003 .

[21]  Vinayak Dixit.  Modeling Origin-Destination Effects on Roundabout Operations and Inflow Control , 2012 .

[22]  Hashem R Al-Masaeid,et al.  Capacity of Roundabouts in Jordan , 1997 .

[23]  Ting Wei,et al.  Developing Capacity Models for Local Roundabouts , 2011 .