Abstract
Turbo roundabouts have been a popular choice of road intersections in the European countries in recent years, since they have better operational and safety performance than conventional roundabouts. To serve the heavy traffic demands, signal controls can be implemented on turbo roundabouts. The objective of this study is to clarify the specific traffic conditions, under which signalized turbo roundabouts are selected to install compared with signalized intersections. The twice-stop-right-turn control method is used for turbo roundabouts under the left-hand driving system. A signal control optimization model for turbo roundabouts is developed. Sensitivity analysis is made to capture the influence of entry volume and the right-turn movement ratio on capacity and average delay. Furthermore, the trend of the capacity of roundabouts with the radius of the central island is studied. It is found that under heavy balanced entry volumes, signalized turbo roundabouts have better operational performance than signalized intersections.
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