Roundabouts have various benefits in terms of safety and capacity issues that are worldwide recognized. Capacity analysis, which is very often key factor in the decision-making process between different types of intersection, can be performed with the empirical regression or gap-acceptance based models. The second model is more suitable for different locations because it depends only on two parameters: critical gap and follow-up headway. This paper presents practical determination of these two parameters on single and two-lane roundabouts in Bosnia and Herzegovina. Study like this was made for the first time in Bosnia and Herzegovina and have high importance for accurate capacity evaluation in local conditions.

roundabouts, gap-acceptance parameters, critical gap, follow-up headway, MLM