为提高城市主干路交通流平均行程时间的估计精度,根据路段上游检测器采集的截面流量,建立了3种BPR(bureau of public roads)修正模型,包括全状态累积流量BPR修正模型、分状态标定的BPR模型和分状态累积流量BPR修正模型.仿真结果表明:全...为提高城市主干路交通流平均行程时间的估计精度,根据路段上游检测器采集的截面流量,建立了3种BPR(bureau of public roads)修正模型,包括全状态累积流量BPR修正模型、分状态标定的BPR模型和分状态累积流量BPR修正模型.仿真结果表明:全状态累积流量BPR修正模型明显优于传统的BPR模型;分状态标定的BPR模型和分状态累积流量BPR修正模型可以进一步提高估计精度,且后者可将阻滞交通状态下的平均估计误差降低至8.05%.展开更多
Process of optimizing coordinated control is divided into two stages. At the first stage, the study improves a robust optimal control model of single-point intersection to optimize cycle and split. At the second stage...Process of optimizing coordinated control is divided into two stages. At the first stage, the study improves a robust optimal control model of single-point intersection to optimize cycle and split. At the second stage, the study combines all links with intersections of arterial road as a complete system, and applies cell transmission model to simulate traffic flow on urban signalized arterial road. We propose a coordinated control model based on the platform to optimize offset between adjacent intersections. Genetic algorithm is executed by MATLAB to solve the model. The performance evaluations show that the model not only effectively reduces average delay and stopping rate of vehicles on arterial road and largely enhances traffic capacity of arterial road, but also lowers the sensitivity of signal control for flow fluctuations.展开更多
文摘为提高城市主干路交通流平均行程时间的估计精度,根据路段上游检测器采集的截面流量,建立了3种BPR(bureau of public roads)修正模型,包括全状态累积流量BPR修正模型、分状态标定的BPR模型和分状态累积流量BPR修正模型.仿真结果表明:全状态累积流量BPR修正模型明显优于传统的BPR模型;分状态标定的BPR模型和分状态累积流量BPR修正模型可以进一步提高估计精度,且后者可将阻滞交通状态下的平均估计误差降低至8.05%.
基金supported by the National Natural Science Foundation of China(No.61174175)the Science & Technology Development Plan of Shandong Province(No.2011GGX10504)+4 种基金the Science Foundation of Shandong Jiaotong University(No.Z201111)the Natural Science Foundation of Shandong Province(No.ZR2009GM032)the Independent Innovation Foundation of Shandong University(No.2009TS046)the Natural Science Foundation of Shandong Province(No.ZR2010FM036)the Science & Technology Projects of Higher Education of Shangdong Province(No. J09LG55)
文摘Process of optimizing coordinated control is divided into two stages. At the first stage, the study improves a robust optimal control model of single-point intersection to optimize cycle and split. At the second stage, the study combines all links with intersections of arterial road as a complete system, and applies cell transmission model to simulate traffic flow on urban signalized arterial road. We propose a coordinated control model based on the platform to optimize offset between adjacent intersections. Genetic algorithm is executed by MATLAB to solve the model. The performance evaluations show that the model not only effectively reduces average delay and stopping rate of vehicles on arterial road and largely enhances traffic capacity of arterial road, but also lowers the sensitivity of signal control for flow fluctuations.
