Safety and Operational Performance of Roundabouts
Li-Sian Tey1, M. S. Salim2, Shahreena Melati Rhasbudin Shah3, Prakash Ranjitkar4
1Li-Sian Tey, Department of Civil Engineering, Universiti Teknologi MARA, Cawangan Pulau Pinang, Permatang Pauh, Malaysia.
2M.S. Salim, Department of Civil Engineering, Universiti Teknologi MARA, Cawangan Pulau Pinang, Permatang Pauh, Malaysia.
3Shahreena Melati Rhasbudin Shah, Department of Civil Engineering, Universiti Teknologi MARA, Cawangan Pulau Pinang, Permatang Pauh, Malaysia.
4Prakash Ranjitkar, Transportation Reseasrch Centre, Department of Civil and Environmental Engineering, University of Auckland, Auckland, New Zealand.
Manuscript received on 27 September 2019 | Revised Manuscript received on 09 November 2019 | Manuscript Published on 22 November 2019 | PP: 198-203 | Volume-8 Issue-6S3 September 2019 | Retrieval Number: F10320986S319/19©BEIESP | DOI: 10.35940/ijeat.F1032.0986S319
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: When there are two or more roads meet, there is higher tendency of conflicts among vehicles. Roundabout is not a new concept to manage conflict points at at-grade intersection. However, improper motorist behaviours especially during peak hour affect safety and operational performance of a roundabout. This paper compares the safety and operational performance evaluation of a conventional non-signalized roundabout and a conventional signalised roundabout and explores the potential of turbo roundabout to replace the conventional ones. Three characteristics used to evaluate safety performance of the roundabouts include entry lane selection, use of entry and exit indicators, and weaving activities. These behaviours create the possibility of conflict, hence, risk of fatalities. On the other hand, delay and total time travel are used as indicators of operational performance of the roundabouts. We used SIDRA INTERSECTION Software to determine the theoretical delays and Level of Services. High delay, a time factor, affects motorists’ emotion, might have contributed to the safety performance. Similarly, motorists’ non-compliance behaviours affected the operational performance.
Keywords: Conventional Roundabout, Turbo Roundabout, Operational Performance, Safety Performance, Driver Behavior.
Scope of the Article: Civil and Environmental Engineering