A method and system for selecting optimal traffic safety alternative indicators for complex road nodes

Abstract

The present invention discloses a method and system for selecting an optimal traffic safety alternative indicator for complex road nodes. The method comprises: demarcating the road area boundaries of the complex road node and storing them in a database in the form of coordinates; periodically acquiring complete microscopic trajectory data of all vehicles within the node, and performing data preprocessing and parameter extraction; determining and verifying dangerous driving scenarios at the node to obtain dangerous scenario data, and performing state classification; constructing a set of candidate alternative indicators, and calculating the value of each candidate alternative indicator for dangerous scenarios; constructing a set of evaluation indicators for the alternative indicators, and calculating the value of each evaluation indicator for each candidate alternative indicator; calculating the distance between each candidate alternative indicator and the corresponding optimal and worst solutions, and selecting the traffic safety alternative indicator with the highest relative proximity to the optimal solution as the optimal traffic safety alternative indicator. The method fully considers the characteristics of each indicator and avoids the limitations of a single indicator.

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