Active Safety Decision-making Behavior Modeling And Early Warning Technology For Pedestrian Crossing Based On Human-vehicle Game

In order to solve the traffic safety problems caused by human-vehicle conflict during pedestrian crossing,the style characteristics of pedestrians and drivers are systematically analyzed,a three-class game model of human-vehicle conflict is constructed,a vehicle safety braking distance model considering human and vehicle characteristics is proposed,and a pedestrian crossing active safety warning system based on vehicle-road cooperation is designed.The study systematically analyzes the dynamic decision-making process of the game of human-vehicle conflict and provides new solutions for reducing the risk of human-vehicle conflict from both theoretical and technical levels.Firstly,a pedestrian and driver style questionnaire was designed,and after organizing the implementation of the questionnaire and conducting reliability tests and content analysis of the survey data,the style characteristics of pedestrians and drivers were analyzed by clustering with the K-means algorithm.After analyzing the style characteristics of pedestrians and drivers,the behavioral tendencies of pedestrians and drivers of various styles were obtained.By analyzing in human-vehicle conflicts,the laws of subjective factors that trigger human-vehicle conflicts are obtained.Secondly,after analyzing the style characteristics of pedestrians and drivers and the subjective factors of pedestrian-vehicle conflict,based on game theory,the game models of mixed strategy,"pedestrian first" and "vehicle first" for pedestrian-vehicle conflict were constructed by considering the effects of delay,risk,pedestrian tension,pedestrian waiting time and pedestrian and vehicle driver styles,and the dominant strategies and strategy choices of pedestrians and vehicle drivers with different styles in different situations were obtained.Then,based on the improvement of parking sight distance model and pedestrian crossing safety psychological distance model,a vehicle safety braking distance model considering human and vehicle characteristics is proposed and a pedestrian crossing active safety warning system based on vehicle-road cooperation is designed.The system adopts a modular design scheme,divided into detection module,control module,warning module and wireless communication module;the system detects the position and speed of pedestrians and vehicles,and discriminates the conflict situation,and executes the corresponding warning scheme for different situations;the system warns pedestrians through voice prompting stakes,and warns pedestrians and vehicles in both directions through the different color display of intelligent crosswalks,which provides a new approach for pedestrian The system provides a new approach for active safety research of pedestrian crossing.Finally,we used 3Ds Max and Unity 3D to build a human-vehicle conflict simulation scenario,and used C# language to develop Unity 3D to establish a conventional simulation environment and a simulation environment of the pedestrian crossing active safety warning system based on vehicle-road coordination.After comparing and analyzing the speed of vehicles and pedestrians,vehicle deceleration,and the number of accidents before and after the application of the system,as well as analyzing the actual operation effect of the system,the effectiveness of the designed pedestrian crossing active safety warning system based on vehicle-road cooperation was verified.