关键词: 交通信号控制, 交通状态, 优化模型, 遗传算法, Paramics仿真

Abstract: In the light of the urban traffic flow characteristics，the traffic status of an isolated intersection is divided into four levels，and a real-time traffic signal control method is proposed on the basis of this traffic status identification.Based on the traffic flow characteristics and control targets of the isolated intersection，this method can choose appropriate evaluation parameters and establish signal timing models for different traffic levels.Simultaneously，an improved genetic algorithm is presented to solve the timing models.This algorithm uses the penalty mechanism of sorting and classifying to handle constraints，and introduces simulated annealing algorithm to enhance the local optimal capability of genetic algorithm.Lastly，the traffic signal timing optimization case of an actual isolated intersection is extensively computed by three kinds of algorithm，and simulated via Paramics.The results indicate that the improved genetic algorithm is effective and the signal strategy derived from the proposed method has better performance.

Key words: traffic signal control, traffic status, optimization model, genetic algorithm, Paramics simulation