{"title":"Roundabout Optimal Entry and Circulating Flow Induced by Road Hump","authors":"Amir Hossein Pakshir, A. Hossein Pour, N. Jahandar, Ali Paydar","volume":68,"journal":"International Journal of Civil and Environmental Engineering","pagesStart":704,"pagesEnd":708,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/7353","abstract":"Roundabout work on the principle of circulation and\r\nentry flows, where the maximum entry flow rates depend largely on\r\ncirculating flow bearing in mind that entry flows must give away to\r\ncirculating flows. Where an existing roundabout has a road hump\r\ninstalled at the entry arm, it can be hypothesized that the kinematics\r\nof vehicles may prevent the entry arm from achieving optimum\r\nperformance. Road humps are traffic calming devices placed across\r\nroad width solely as speed reduction mechanism. They are the\r\npreferred traffic calming option in Malaysia and often used on single\r\nand dual carriageway local routes. The speed limit on local routes is\r\n30mph (50 km\/hr). Road humps in their various forms achieved the\r\nbiggest mean speed reduction (based on a mean speed before traffic\r\ncalming of 30mph) of up to 10mph or 16 km\/hr according to the UK\r\nDepartment of Transport. The underlying aim of reduced speed\r\nshould be to achieve a 'safe' distribution of speeds which reflects the\r\nfunction of the road and the impacts on the local community.\r\nConstraining safe distribution of speeds may lead to poor drivers\r\ntiming and delayed reflex reaction that can probably cause accident.\r\nPrevious studies on road hump impact have focused mainly on speed\r\nreduction, traffic volume, noise and vibrations, discomfort and delay\r\nfrom the use of road humps. The paper is aimed at optimal entry and\r\ncirculating flow induced by road humps. Results show that\r\nroundabout entry and circulating flow perform better in\r\ncircumstances where there is no road hump at entrance.","references":"[1] Robinson, B. W., L. Rodegerdts, W. Scarbrough, W. Kittelson, R. Troutbeck,\r\nW. Brilon, L. Bondzio, K. Courage, M. Kyte, J. Mason, A.\r\nFlannery, E. Myers, J. Bunker, and G. Jacquemart. \"Roundabouts: An\r\nInforma- tional Guide\". Report FHWA-RD-00-067. FHWA, U.S.\r\nDepartment of Transportation, June 2000. 2.\r\n[2] Mohamed A. Aty, Yasser Hosni, \"ROUNDABOUTS DESIGN,\r\nMODELING AND SIMULATION\". STATE-OF-THE-ART.\r\nDepartment of Civil & Environmental Engineering University of Central\r\nFlorida. March 2001.\r\n[3] Shashi S. Nambisan, Venu Parimi (March 2007). \"A Comparative\r\nEvaluation of the Safety Performance of Roundabouts and Traditional\r\nIntersection Controls\". Institute of Transportation Engineers\r\n[4] Highway Capacity Manual (2000). National Research Council\r\nWashington, D.C. 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