Roundabout has been widely adopted, due to its convenience for improving safety at an intersection by reducing speed and conflicts points. This article presents a roundabout capacity model located in Tangier, Morocco. The study is based on regression analysis and roundabout delay simulation to determine level of service, LOS. Roundabout capacity model is determined by the relationship between entry flow and circulating flow. It’s one of the parameters that determines the efficiency of the roundabout design, to facilitate the passage without conflicts and minimum delay. There are more parameters that affect roundabout capacity, as geometrical features, driver behaviour, weather conditions and pedestrian presence. In this work, we are interested in the hourly vehicles flow in different time interval during a day at the roundabout entrances and the circulatory lanes.

Keywords : Roundabout Capacity Model, Regression Analysis, Tangier City, LOS.