Evaluating the impact of pedestrian crossings on roundabout entry capacity

An empirical approach to the estimation of roundabout entry capacity in the presence of significant levels of pedestrian crossing volumes is developed in this study on the basis of experimental observations. Impedance caused by pedestrians to approaching traffic is quantified using crosswalk occupancy time, rather than pedestrian volume. The analysis described in the paper leads to the estimation of a capacity reduction index, that can be used in operational analysis to obtain realistic estimates of roundabout entry capacities taking into account the impact of pedestrian crossings.