Study On Coordinated Signal Control Of Road Sections Considering Crosswalks

Interference generated when motor vehicles,pedestrians and non-motorized vehicles are mixed on the road is one of the important factors causing urban traffic congestion.Reducing the interference and enhancing the coordination between various traffic modes are urgent issues in the current traffic field.Based on the concept of "human-centered transportation",the system of crosswalks and upstream and downstream intersections on road sections is studied to ensure the safety of pedestrian crossing while coordinating the right-of-way of pedestrians and motor vehicles:Firstly,the pedestrian traffic flow parameters and pedestrian crossing tolerance time at signalized roadway crossings were investigated through data survey statistics to establish the basis for the coordinated control model of crosswalks and upstream and downstream intersections.The study of pedestrian traffic flow parameters included speed characteristics and flow characteristics,among which speed characteristics were studied for different genders,ages,and number of partners;the flow characteristics were analyzed based on the survey data and the pedestrian arrival pattern at the pedestrian crossings of the roadway was verified to be in accordance with the negative binomial distribution when the pedestrian arrival fluctuations were large.Secondly,based on the empirical research data,we used survival analysis to obtain the maximum tolerance time of 78 seconds for pedestrians crossing at signalized crosswalks,and constructed a Cox risk regression model for the tolerance time of pedestrians crossing at signalized crosswalks to analyze the effects of gender,age,pedestrian phase red light duration,crosswalk length and travel time on the maximum tolerance time of pedestrians crossing.Then the signal timing setting requirements for crosswalks were investigated to provide a basis for coordinating the timing within the system of pedestrian crossings and upstream and downstream intersections.Based on the constructed system consisting of roadway pedestrian crossings and upstream and downstream intersections,pedestrian delay model and motor vehicle delay model at the roadway signal control pedestrian crossings and pedestrian delay model and motor vehicle delay model at the intersections and roadway travel time model of the coordinated system were developed respectively,with the objective of minimizing pedestrian delay,motor vehicle delay and roadway travel time within the coordinated system for optimization,and proposed to use genetic algorithm for the solution.Finally,according to the established signal coordination and control optimization model for crosswalks and upstream and downstream intersections of the roadway,we conducted an example analysis,and compared the signal timing and phase difference schemes derived from the Webster timing and MAXBAND arterial coordination optimization models with the signal timing and phase difference schemes derived from this paper using genetic algorithm to solve the model and the status signal timing scheme,and verified the effectiveness and feasibility of the model.The model could effectively reduce motor vehicle delays,pedestrian delays and roadway travel times in the coordinated system,and improve the safety of pedestrian crossing and the efficiency and coordination of motor vehicle operation in the coordinated system.