Anomalous Quality of Service Deterioration at Roundabouts Caused by Rainfall
The paper investigated the extent to which rainfall influences the quality of service delivery at multilane roundabouts using a novel quality of service approach. Quality of service is defined as how well roundabouts operate based on road users and road providers’ perception of service quality. Delay and reserve capacity were used respectively as proxies for road users and road providers’ perception of service quality. The entry and circulating traffic data were recorded continuously for eight weeks under dry, light, moderate, and heavy rainfall weather conditions at each surveyed roundabout, then collated, analysed and compared. Linear regression with dummy variable was used to model the roundabout entry capacity and a corrector factor was added to modify the regression function. The corrector factor considered different entry radii and entry angles of surveyed roundabouts. Multi-criteria quality of service table with travel time as proxy for road users and speed as proxy for road providers’ perception of service delivery was developed from peak traffic data and used to determine the extent of deterioration. The multi-criteria table introduced in the paper is a clear departure from the speed-based criteria used in many studies. The results show a significant increase in time delay and a decrease in reserve capacity relative to rainfall. The paper has concluded that rainfall has an anomalous negative effect on the quality of service at multilane roundabouts. The findings could be used in a variety of ways in traffic management to predict the travel time at roundabouts under rainy conditions and to prescribe speed limits accordingly.
Akcelik R. Roundabout Model Calibration Issues and a Case Study. Proceedings 2005 Transportation Research Circular E-C083: National Roundabout Conference. TRB of the National Academies, Washington, DC.
Akcelik R. Assessment of the Highway Capacity Manual 2010 Roundabout Capacity Manual. Proceedings of the 3rd International Conference on Roundabouts, Carmel, Ind. Washington DC: Transportation Research Board of the National Academies; 2011.
Al-Omari B, Al-Masaeid H, Al-Shawabkah Y. Development of a Delay Model for Roundabouts in Jordan. Journal of Transportation Engineering. 2004;130: 76-82.
Attivor R, Jha M. Modeling Gap Acceptance and Driver Behavior at Stop-controlled (priority) Intersections in Developing Countries. Proceedings 2012 of the American Conference on Applied Mathematics, Harvard, Cambridge, USA. p. 29-38.
Ben-Edigbe J. Estimation of Midblock Median Opening U-Turn Roadway Capacity Based on Sectioning Method. Discrete Dynamics in Nature and Society. 2016. Available from: doi:10.1155/2016/8293240
Brilon W. Delay at Unsignalized Intersections. Journal of the Transportation Research Board. 2008;(2071): 98-108.
Florida Department of Transportation. Quality/Level of Service Handbook 2013. Miami, Florida, USA: Florida Department of Transportation (FDoT); 2013.
Glossary of Meteorology. Rain. American Meteorological Society; 2000.
Highway Capacity Manual, HCM 2010. National Research Council, Washington, DC, USA: Transportation Research Board (TRB); 2010.
Johnson M. Synthesis of Roundabout Geometric Capacity Measurement: Calibration and Validation to US Field Measurements. Transportation Research Board Annual Meeting, TRB 2012, Washington, D.C.
Kimber RM, Hollis EM. Traffic queues and delays at road junctions. Transport Research Laboratory, DOE. DTp. TRRL Report 1980 LR 909. Crowthorne, United Kingdom.
Kita H, Kouchi A. Quantifying perceived quality of traffic service and its aggregation structure. Transportation Research Part C. 2011;19(2): 296-306.
Lenters and Rudy. HCM Roundabout Capacity and Alternative Capacity Models. Institute of Transportation Engineering Journal. 2010;80(7): 22-27.
Mashros, N, Ben-Edigbe, J, Hassan, S. A. Impact of rainfall condition on traffic flow and speed: a case study in Johor. Jurnal Teknologi. 2014;70: 65-69.
Transportation Research Board. Highway Capacity Manual. Special Report 209, National Research Council Washington D.C., Transportation Research Board, 1999.
Rodegerdts L, Blogg M, Wemple E, Myers E, Kyte M, Dixon M, List G, Flannery A, Troutbeck R, Brillion W. Roundabouts in the USA. NCHRP Web-Only Document 94- 572: National Research Council, Washington DC, Transportation Research Board, 2007.
Wong S, Yang H. The Estimation of Reserve Capacity in Traffic Control. Hong Kong Institute of Engineer Transactions. 1997;4: 21-30.
Qu Z, Duan Y, Hu H, Song X. Capacity and delay estimation for roundabouts using conflict theory. The Scientific World Journal. 2014;2014: Article ID 710938. Available from: doi:10.1155/2014/710938 [Accessed 20 June 2017].
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