Geometric factors influencing entry capacity of roundabouts under heterogeneous traffic conditions

Authors

  • Arun Baby ZACHARIA National Institute of Technology Calicut, Department of Civil Engineering, Kerala, India Author
  • Harikrishna MADHAVAN National Institute of Technology Calicut, Department of Civil Engineering, Kerala, India Author
  • M. V. L. R. ANJANEYULU National Institute of Technology Calicut, Department of Civil Engineering, Kerala, India Author

DOI:

https://doi.org/10.5604/01.3001.0013.2778

Keywords:

roundabout, entry capacity, geometry, heterogeneous traffic, traffic conditions, regression

Abstract

Roundabout entry capacity is influenced by geometric features of the roundabout, traffic flow characteristics, vehicle are checked. In comparison with the existing empirical models such as the LR942 regression model and German empirical model, the proposed regression model produced better estimates and much lower RMSE values. Approach width is found to have the highest impact on entry capacity. The entry capacity is found to be negatively influenced by entry angle. Circulating flow is considered in terms of per metre width against the usual convention. This modification incorporates the effect of circulatory roadway width also into consideration. The circulatory roadway width has a diverse effect on entry capacity at different levels of circulating flow. Modification of inscribed circle diameter and circulatory roadway width is suggested as a potential solution for improving entry capacity. Sensitivity analysis is carried out to quantify the effect of variation of entry angle, circulatory roadway width, inscribed circle diameter and approach width on entry capacity based on the non-linear model. The sensitivity plots can be used to make subtle geometric modifications to improve capacity at congested roundabouts.

References

ABHIGNA, D., KONDREDDY, S., & SHANKAR, K. V. R. R., 2016. Effect of vehicle composition and delay on roundabout capacity under mixed traffic conditions. Archives of Transport, 40(4), 7–14.

AHMAD, A., & RASTOGI, R., 2016. Regression model for entry capacity of a roundabout under mixed traffic condition - an Indian case study. Transportation Letters, 9(5), 243–257.

AKCELIK, R., 2007. A Review of gap-acceptance capacity models. in Proceedings of 29th Conference of Australian Institutes of Transport Research. Adelaide: University of South Australia.

AKCELIK, R., CHUNG, E., & BESLEY, M., 1998. ARR 321 Roundabouts : Capacity and performance analysis. ARRB Transport Research Ltd. Vermont South, Australia.

AL-MADANI, H. M. N., 2013. Capacity of Large Dual and Triple-Lanes Roundabouts During Heavy Demand Conditions. Arabian Journal for Science and Engineering, 38(3), 491–505.

AL-MADANI, H. M. N., & PRATELLI, A., 2014. Modelling and calibrating capacity of large roundabouts. International Journal of Sustainable Development and Planning, 9(1), 54–73.

AL-MASAEID, H., & FADDAH, M., 1997. Capacity of Roundabouts in Jordan. Transportation Research Record: Journal of the Transportation Research Board, 1572, 76–85.

ANJANA, S., & ANJANEYULU, M. V. L. R., 2015. Development of Safety Performance Measures for Urban Roundabouts in India. Journal of Transportation Engineering, ASCE, 141(1), 1–8.

ARASAN, V. T., & KRISHNAMURTHY, K., 2008. Effect of traffic volume on PCU of vehicles under heterogeneous traffic conditions. Road & Transport Research, 17(1), 32–49.

AYRES, L. P., 1920. The Correlation Ratio. The Journal of Educational Research, 2(1), 452–456.

BARED, J., PROSSER, W., & ESSE, C., 1997. State-of-the-Art Design of Roundabouts. Transportation Research Record: Journal of the Transportation Research Board, 1579, 1–10.

BRILON, W., KOENING, R., & TROUTBECK, R. J., 1999. Useful estimation procedures for critical gaps. Transportation

Research Part A, 33(3), 161–186.

BRILON, W., & VANDEHEY, M., 1998. Roundabouts - The state of the art in Germany. ITE Journal, 68(11), 48–54.

CHODUR, J., & BAK, R., 2016. Study of driver behaviour at turbo-roundabouts. Archives of Transport, 38(2), 17–28.

CRATHORNE, A. R., 1922. Calculation of the Correlation Ratio. Journal of the American Statistical Association, 18(139), 394–396.

CROWN, R. B., 1987. RODEL - An alternative approach to roundabout design. Highways & Transportation, 34(10), 12–19.

CSIR - CENTRAL ROAD RESEARCH INSTITUTE, 2017. Indian Highway Capacity Manual. New Delhi: Council of Scientific and Industrial Research.

FARAH, H., BEKHOR, S., POLUS, A., & TOLEDO, T., 2009. A passing gap acceptance model for two-lane rural highways. Transportmetrica. Taylor & Francis, 5(3), 159–172.

FEDERAL HIGHWAY ADMINISTRATION, 2000. Roundabouts: An Information Guide. FHWA- RD- 00–067. US Department of Transport. Virginia, USA.

HAGRING, O., 2001. Derivation of Capacity Equation for Roundabout Entry with Mixed Circulating and Exiting Flows. Transportation Research Record: Journal of the Transportation Research Board, 1776, 91–99.

KIMBER, R. M., 1980. The Traffic Capacity of Roundabouts. TRRL Laboratory Report 942. Transport and Road Research Laboratory. Crowthorne, United Kingdom.

KIMBER, R. M., 1989. Gap-Acceptance and Empiricism in Capacity Prediction. Transportation Science, 23(2), 100–111.

LINDENMANN, H., 2006. Capacity of Small Roundabouts with Two-Lane Entries. Transportation Research Record: Journal of the Transportation Research Board, 1988, 119–126.

MACIOSZEK, E., 2010. The review of capacity formulas for small roundabouts. Scientific Journal of Silesian University of Technology. Series Transport, 67, 83–90.

MACIOSZEK, E., 2015. The road safety at turbo roundabouts in poland. Archives of Transport, 33(1), 57–67.

MATHEW, S., DHAMANIYA, A., ARKATKAR, S. S., & JOSHI, G., 2017. Roundabout Capacity in Heterogeneous Traffic Condition: Modification of HCM Equation and Calibration. Transportation Research Procedia. Elsevier B.V., 27, 985–992.

MOHAN, M., & CHANDRA, S., 2017. Critical gap estimation at two-way stop-controlled intersections based on occupancy time data. Transportmetrica A: Transport Science. Taylor & Francis, 14(4), 316–329.

NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM, 2006. NCHRP web-only document 94: Appendixes to NCHRP Report 572: Roundabouts in the United States. Transportation Research Board, Washington, DC.

NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM, 2007. NCHRP Report 572 Roundabouts in the United States. Transportation Research Board, Washington, DC.

NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM, 2010. NCHRP Report 672 Roundabouts: An Informational Guide. Transportation Research Board, Washington, DC.

PATNAIK, A. K., RAO, S., KRISHNA, Y., & BHUYAN, P. K., 2016. Empirical capacity model for roundabouts under heterogeneous traffic flow conditions. Transportation Letters, 9(3), 152–165.

PATNAIK, A. K., KRISHNA, Y., RAO, S., & BHUYAN, P. K., 2017. Development of Roundabout Entry Capacity Model Using INAGA Method for Heterogeneous Traffic Flow Conditions. Arabian Journal for Science and Engineering, 42(9), 4181–4199.

PATNAIK, A. K., RANJAN, A. R., & BHUYAN, P. K., 2018. Investigating Entry Capacity Models of Roundabouts under Heterogeneous Traffic Conditions.

Transportation Research Record: Journal of the Transportation Research Board, 2672(15), 35–43.

POLUS, A., & SHMUELI, S., 1997. Analysis and Evaluation of the Capacity of Roundabouts. Transportation Research Record: Journal of the Transportation Research Board, 1572, 99–104.

REN, L., QU, X., GUAN, H., EASA, S., & OH, E., 2016. Evaluation of Roundabout Capacity Models : An Empirical Case Study. Journal of Transportation Engineering, ASCE, 142(12), 1–8.

ROCHE, A., MALANDAIN, G., PENNEC, X., & AYACHE, N., 1998. The correlation ratio as a new similarity measure for multimodal image registration. in Proceedings of Medical Image Computing and Computer-Assisted Intervention-MICCAI’98. Berlin, Heidelberg: Springer Berlin Heidelberg, 1115–1124.

TRANSPORTATION RESEARCH BOARD, 2000. Highway Capacity Manual 2000. National Research Council, Washington, DC.

TRANSPORTATION RESEARCH BOARD, 2010. Highway Capacity Manual 2010. National Research Council, Washington, DC.

TROUTBECK, R. J., 1984. Capacity and delays at roundabouts: A literature review. Australian Road Research Board, 14(4), 205–216.

WU, N., 2012. Equilibrium of Probabilities for Estimating Distribution Function of Critical Gaps at Unsignalized Intersections. Transportation Research Record: Journal of the Transportation Research Board, 2286, 49–55.

YAP, Y. H., GIBSON, H. M., & WATERSON, B. J., 2015. Models of roundabout lane capacity. Journal of Transportation Engineering, ASCE, 141(7), 1–12.

Downloads

Published

2019-03-31

Issue

Section

Original articles

How to Cite

ZACHARIA, A. B., MADHAVAN, H., & ANJANEYULU, M. V. L. R. (2019). Geometric factors influencing entry capacity of roundabouts under heterogeneous traffic conditions. Archives of Transport, 49(1), 87-101. https://doi.org/10.5604/01.3001.0013.2778

Share

Similar Articles

1-10 of 272

You may also start an advanced similarity search for this article.