CAPACITY AND PERFORMANCE ANALYSIS OF SUAME ROUNDABOUT, KUMASI-GHANA

E.K. Nyantakyi, J.K. Borkloe, P.A. Owusu

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 analyzed capacity and performance of Suame roundabout in Kumasi, Ghana. Traffic and geometric data were collected on the field. The analysis revealed that Suame roundabout was operating at a level of service F, which represented worst conditions. Signalized intersection with 5 approach lanes was proposed to control all the movements. Exclusive pedestrian phases were proposed to protect pedestrians.

Keywords: Performance analysis, Suame roundabout, Capacity analysis, Transportation network performance, Mampong Road

DOI: https://doi.org/10.15623/ijret.2013.0208001