Cellular Automaton Modeling of the Interaction between Vehicles and Pedestrians at Signalized Crosswalk

Characteristics of mixed traffic on a road with a signalized crosswalk are investigated by cellular automaton modeling. The interaction mechanism between vehicles and pedestrians is taken into account. Also, the inordinate behavior of vehicles near the crosswalk, and various behaviors of three types of pedestrians (i.e., careful pedestrians, normal pedestrians, and riskers), are incorporated into the proposed model. By using numerical simulations, the case for pedestrian flow consisting of careful and normal pedestrians is investigated. Phase diagrams and spatiotemporal diagrams are presented to show different traffic states. The results show that there is a critical value that divides the vehicle flow into a free flow portion and a congested flow portion. Interestingly, there are two critical values for pedestrian flow for a large signal cycle value, whereas there is only one critical value when the signal cycle value is smaller than a critical value. Finally, the variation of violating frequency against time during a signal cycle is investigated. It is found that there are two local maximum values on the frequency curves when the pedestrians consist of all three types, and this phenomenon is coincident with the qualitatively real traffic. DOI: 10.1061/(ASCE)TE.1943-5436.0000462. (C) 2012 American Society of Civil Engineers.