A traffic safety evaluation method for unsignalized intersections

Abstract

The invention discloses a method for evaluating the traffic safety of an unsignalized intersection. The method includes the steps of selecting an intersection to researched, obtaining basic data, processing basic data of the intersection, establishing a coordinate system and carrying out grid division, obtaining the conflict probability of each grid, assigning inner grids of the entire intersection to form a conflict probability matrix, obtaining the severe degree of conflict probability of each grid according to a conflict severe degree kinetic energy loss model, assigning the grids in the entire intersection, determining the safety evaluation index of each grid in the entire intersection by using a grey cluster method and taking conflict probability and conflict severe degree into consideration, assigning equivalent codes to each grid and constructing a grade code matrix, and realizing visualized output of the safety evaluation result through a programming language. Comprehensive safety evaluation index determination and visualized output of safety evaluation of the entire intersection are realized.

Description

technical field [0001] The invention relates to the technical field of urban road intersection safety design and evaluation, in particular to a traffic safety evaluation method for unsignalized intersections that integrates collision probability and collision severity. Background technique [0002] Urban road level intersections are the "throats" of the urban road network, where the flow of people, bicycles, and motor vehicles converge; at the same time, they are also nodes where road users change their driving directions, where traffic conflicts are concentrated and traffic accidents occur frequently. Its safety problem has always been the focus of people's attention, and intersection conflict analysis and safety evaluation have become a very important content in the field of traffic engineering research. [0003] At present, the evaluation methods of intersection traffic safety at home and abroad are mainly divided into two aspects: the classification of multiple intersect...

AI Technical Summary

Problems solved by technology

Although the methods of safety evaluation at home and abroad are relatively comprehensive, there are still several problems: 1. Although there are many studies on the probability of intersection conflict, there are few single-intersection safety evaluation methods based on this. The reason is that most of the existing studies on the conflict probability of intersections focus on the conflict point as the research object, and it is impossible to evaluate the entire intersection situation relatively comprehensively; Second, the research focuses on the safety level division of the entire intersection, while relatively ignoring the conflict situation and safety level inside the intersection , making little contribution to the regulation of intersection black spots; 3. The safety evaluation index is relatively single, and the evaluation results are mostly presented in the form of data, which is not conducive to reading and storing when the amount of data is large

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