Abstract
Pedestrian dynamics has been being a popular research area. In this paper, breakdown probability in the bidirectional flow that includes pedestrians with heterogeneities is investigated. Reaction time appears to have the most pronounced breakdown proba- bility, followed by desired velocity and then body size. The relationship between the start time of breakdown and inflow reflects the decreasing trend of the start time of breakdown with increasing inflow. Furthermore, the smaller the value of the start time of breakdown for the same inflow, the larger the effect of the heterogeneity in a parameter of the social force model on breakdown by cross-comparisons.
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