关于城市路网交叉口信号延误准确估计仿真

Accurate Estimation Simulation of Signal Delay at Urban Road Network Intersections

城市路网交叉口信号延误能精准反映出交叉口的运行效率和服务水平,传统延误估计方法在分析信号控制影响时往往需要多项输入数据,采集成本较大,因此大多研究仅从运动学角度出发分析延误特征,算法复杂且准确度低。为解决准确度和成本之间的矛盾,通过平移车辆时空轨迹计算延误估计所需参数,利用K-S检验和密度聚类算法得到交叉口信号配时,根据交通波理论得到交叉口受阻车辆总数,进而结合交叉口车流运动机理计算平均延误。最后通过VISSIM软件对单交叉口进行仿真,结果表明信号配时估计误差在5s内,直行和左转平均延误误差率分别在16%和26%内。说明方法能在数据信息单一的情况下保证延误准确度,具备有效性与实用价值。

Urban road network intersection signal delay can accurately reflect the operational efficiency and service levels of the intersection.Traditional delay estimation methods often require multiple input data for analyzing the effects of signal control and with large acquisition costs.Therefore,most of the studies only analyze the delay features from the perspective of kinematics.The algorithm is complex and the accuracy is low.To solve the conflict between accuracy and cost,the parameters required for delay estimation were calculated by translating the vehicle’s space-time trajectory,K-S test and density clustering algorithm were used to get the key information of intersection signal timing,and the total number of intersections blocked vehicles was calculated according to the traffic shockwave theory.Then the average delay was calculated with the principle of traffic flow.Finally,the single intersection was simulated with VISSIM software.The result shows that the estimated error of signal timing is within 5 s,and the average delay error rate of straight-ahead and left-turn is within 16% and 26% respectively.The method can guarantee the accuracy under the single data information,and has the validity and practical value.