PERFORMANCE EVALUATION OF SANTASI ROUNDABOUT, KUMASI-GHANA USING MICRO SIMULATION MODEL

Emmanuel Kwesi Nyantakyi, Julius Kwame Borkloe, Abena Obiri-Yeboah, Drussilla Pobee

Abstract: Roundabouts are an increasingly popular alternative to traffic signals for intersection control in the United States. Roundabouts have a number of advantages over traffic signals depending on the conditions. They reduce the severity of crashes since head-on and rightangle conflicts are nearly eliminated. They reduce through traffic speeds to provide a “calmer” roadway environment. They may consume less land area since turn pocket lanes are not needed and also have lower energy and maintenance costs. This study evaluated performance of Santasi roundabout in Kumasi, Ghana using micro simulation model. Traffic and geometric data were collected on the field. The analysis revealed that Santasi roundabout was operating at a level of service F, which represented worst conditions. Signalized intersection with 4 approach lanes was proposed to control all the movements. Exclusive pedestrian phases were proposed to protect pedestrians

Keywords: Performance evaluation, Santasi roundabout, Capacity analysis, Transportation network performance

DOI: https://doi.org/10.15623/ijret.2013.0208015