Design And Analysis Of Mixed Pedestrian Crossing Method At Intersection

Pedestrians are vulnerable groups among traffic participants,and their safety has attracted much attention.Conflicts between pedestrians and motor vehicles often occur at intersections with complex traffic conditions,and the safety of crossing pedestrians is closely related to crossing methods.There are two commonly used crossing methods,the traditional secondary crossing method and the pedestrian phase crossing method.However,the traditional secondary crossing method for left-turned pedestrians requires four crossings to achieve leftturn,and the number of pedestrian crossings is large and the delay is large.For pedestrians arriving at the end of the pedestrian phase,the pedestrian crossing method with pedestrian-specific phase needs to wait for a whole vehicle phase.Pedestrians wait for a long time to cross the street,which is easy to cause the phenomenon of breaking the red light.According to the characteristics of the above two pedestrian crossing methods,this paper proposes a hybrid pedestrian crossing method,including specific method design,effectiveness evaluation,safety analysis and applicability analysis.In terms of specific method design,combined with the advantages of short primary crossing distance of traditional secondary crossing method and pedestrian-specific phase diagonal crossing,a hybrid pedestrian crossing method that needs to set the central safety island at the intersection is proposed,and the channelization design of the intersection of the hybrid crossing is carried out.According to the vehicle trajectory,the area of the central safety island at intersections of different sizes and the number of pedestrians that can be accommodated are calculated.In terms of effectiveness evaluation,firstly,the pedestrian delay model in each direction of a cycle is established according to the variation of pedestrian flow with time,and compared with the existing two methods.At the same time,the number model of vehicles that can pass through when pedestrians and motor vehicles conflict is given,and the influence of pedestrians who have not finished crossing the street at the end of the green light on the capacity of motor vehicles in the next phase is analyzed.The relationship between the capacity of motor vehicles and the flow of pedestrians crossing the street and the length of green light is given.The results show that the delay time of the hybrid pedestrian crossing method is the smallest in the crossing across the road at the destination,and the duration is significantly shorter than that of the traditional secondary crossing method and the crossing method with pedestrian-specific phase.Compared with the green light duration of the motor vehicle,the hybrid pedestrian crossing method has little effect on the traffic capacity of the motor vehicle,indicating that this method will not affect the normal traffic of the motor vehicle.In terms of safety evaluation,the indirect traffic safety evaluation method based on SSAM is used to evaluate the safety of pedestrians crossing the street at the end of the green light and the next phase of vehicle conflict.The measured data of this intersection are used to verify the effectiveness of SSAM.The safety simulation shows that the influence of pedestrians and vehicles is small,and the speed of vehicles at the intersection is slow,which will not pose a threat to the safety of pedestrians.In terms of applicability,the method proposed in this paper needs to set a safety island at the intersection,in order to make the study more operable,finally through the two factors of pedestrian flow and pedestrian crossing width to explore the use of mixed pedestrian crossing conditions for the destination across the road.