信号交叉口排队长度动态计算方法研究

Dynamic model of calculating queue length at signalized intersection

利用北京市道路交通的实测数据 ,对比分析了国外多种信号交叉口排队长度计算方法的结果。在此基础上 ,以 SIGNAL94为基本模型 ,针对北京市交通的实际情况 ,建立了适合北京市交通特性和动态计算的排队长度优化模型。运用时间平滑处理方法减小了交通系统随机性对计算精度的影响。经过实际数据的验证 :在通常的交通条件下 ,优化模型的相对误差保持在 5 %左右。

Measurements on several queue length models were compared with each other based on the survey data from Dongdan intersection. Then SIGNAL94 was selected as the basic model for describing the traffic condition in Beijing.An optimum model, which was suitable for dynamic calculation, was put forward based on the analysis of oversaturated flow and a method of time smooth was provided in order to reduce the error due to random characteristics of traffic system. Based on the survey data analysis, the optimum model was proven, and the queue length precision was about 95% under the preveiling traffic conditions.