Construction of cellular automata model of alternate operation between pedestrians and vehicles at signal intersection

To determine the form of crossing facilities,The traffic characteristics of pedestrians' walking speed and vehicles' queuing spacing,headway of steering were analyzed in signalized intersection. The probabilistic model of acceptable gap choice for pedestrians crossing the intersection was constructed by survey and analysis of conflicting operations between pedestrians and vehicles. On the theoretical foundation of characteristics from alternate operations between pedestrians and vehicles, rules concerning pedestrians walking forward,avoidance,lateral walking forward, vehicles stop-to-slow following, steering following, and target lanes selection in bidirectional six lanes were established; selective rules concerning conflicts identification between pedestrians and vehicles at pedestrian crossroads were introduced. Therefore,the cellular automata model of alternate operations between pedestrians and vehicles at signal intersection was constructed through overlapping the previous two rules. Taking the main signal intersection in the bidirectional six lanes as an example,the applicability of exclusive pedestrian signal phase and overpassing facilities were analyzed. The result indicates that the overpassing facilities are supposed to be adopted when the traffic less than 90 s,the proportion of left turn green split time is no less than 50% and the pedestrian volume is no less than 2 700 Ped·( h·m)-1.