Institute of Transportation, MOTC

       Pedestrian accidents at intersections are increasing every year. Most overpasses and underpasses, such as overpasses and underpasses, are mostly demolished because of their low utilization. However, in some places, elevators or escalators are added to encourage pedestrians to use the overpass and underpass to guide pedestrians to use the overpass and underpass. Most studies consider the number of accidents as an important basis for judging the severity of the intersection conflict and determining whether the overpass and underpass are being removed. This study considers that there are few accidents. And the overpass and pedestrian underpass should not be removed due to the low number of accidents and low usage rates. The adequacy of the overpass and pedestrian underpass should be thoroughly examined. In the study, the actual intersection data was collected by video recording during morning rush hours on weekdays, and the simulated intersection environment was established using PTV VISSIM micro-traffic flow software to output traffic flow and vehicle trajectories. The Surrogate Safety Assessment Model (SSAM) calculates the conflicts between pedestrians and vehicles at the intersection and establishes multiple linear regression and binary logistic regression to find out the Post-Encroachment Time (PET) that affects the intersection and whether pedestrians are at the intersection Factors of risk of conflict. The research results show: (1)the number of conflict events and the number of pedestrians or vehicles entering the conflict zone will affect the reduction of Post-Encroachment Time (PET); (2) the type of vehicle will affect the risk of conflict when pedestrians cross the intersection; (3)It can be seen that the factors of conflicts between pedestrians and vehicles at the intersection are affected by the number of incidents, the number of pedestrians, the number of vehicles and the type of vehicles that first enter the conflict zone. To ensure the safety of pedestrian crossing at intersections, a more effective approach can be applied by making the following changes: replacing the number of conflicts by the number of incidents that interfere with pedestrians and vehicles, dividing the traffic flow of pedestrians and vehicles into the flow of cars,scooters,and buses that interfere with pedestrians, adding the number of pedestrians or vehicles that first enter the conflict zone, and keeping the rest of the items unchanged.