城市快速路人口匝道控制方法

以北京快速路为研究对象,基于典型路段调查数据对快速路的交通流特性进行了分析,提出了入口匝道优化控制方法。采用时间占有率与速度两个参数作为控制变量实现入口匝道的反馈控制机制,以两者的综合控制效果确定入口匝道的调节流量。采用模式识别中的线性判别函数对模型中的临界阈值进行标定。利用VISSIM对提出的控制方法进行了模拟验证。结果表明:与无信号控制方式相比,本文方法可提高主线平均速度8%左右,减小行程时间7.2%。

On-ramp metering control strategy of urban expressway

Taking Beijing urban expressway system as a research object,its traffic flow characteristics were analyzed based on the survey data collected from its representative sections,and a optimization control strategy for the on-ramp metering was suggested.A feedback control to the on-ramp was realized by the ime occupancy and the vehile speed as the control variables,and using the comprehensive control effect of both parameters to determine the on-ramp metering rate.The critical threshold in the model was calibrated using the linear discriminant function in the pattern recognition. The suggested strategy was verified by simulation with software VISSIM.The results show that compared with those of without signal control mode,the suggested strategy increases the average speed on the mainline upstream at on-ramp by about 8%,and decreases the travel time on the mainline section by 7.2%.