Increasing use of compact roundabouts in urban areas where there are pedestrians and cyclists, raises the need to quantify their influence on entry capacity. This paper studies, with the help of a simulation method, the influence on entry capacity of pedestrians at the entry side of the crosswalk of roundabouts, the estimation of blocking time at ring roads caused by pedestrians at the exit side of the crosswalk of roundabouts and its influence on the capacity at the previous entry. It also investigates the influence of cyclists on entry capacity. Two entry capacity estimation methods with cyclist influence being taken into account are proposed: (1) converting circulating cyclists to equivalent cyclists to equivalent circulating vehicle units, and (2) direct estimation without using a converting coefficient. In this paper, both the narrow ring road case, where circulating vehicles cannot overtake cyclists, and the wide ring road case, where circulating vehicles can overtake them, are investigated. The coefficient for converting circulating cyclists to equivalent vehicle units is determined. It is not a constant and depends inversely on circulating vehicle volume. (A)
Abstract