Abstract
According to the models which are commonly used in practice, the capacity of roundabouts depends on the value of critical headway. Critical headway size depends on numerous objective factors, primarily on geometric characteristics of the intersection. However, research so far have shown that beside characteristics of the intersection, value of critical headway depends on many other factors, primarily on driver behavior. Driver behavior is the result of the action of numerous factors that depend on the influence of local environment, habits, mentality, etc. For that very reason, determination of the value of this traffic flow parameter in local research is recommended in many models. Within this paper, the results related to the value of critical headway determined by research which are conducted in Bosnia and Herzegovina are presented. The presented value of critical headway can be used for objective determination of roundabout capacity in our region.
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