高速公路改扩建后区域路网交通分流模型

Traffic diversion model of regional network for freeway reconstruction

为量化分析高速公路改扩建分流后区域路网的拥挤程度和服务水平,充分考虑路网分流条件,以系统饱和度为约束条件,以区域路网内分流系统最优为目标,建立了具有实时反馈效用的高速公路改扩建交通分流机制和分配模型。以陕西潼关至宝鸡高速公路改扩建作业项目为例,应用新建模型对2种交通分流方案进行了对比。研究结果表明:该模型考虑分流路段的交通量分担能力,以分流后路段交通量和路段通行能力之比作为权重系数,来反映分流后区域路网的交通拥挤状况,能够实现区域路网内交通分流的系统最优,达到配流均衡。通过应用该方法对大型车分流和小汽车分流两套方案进行的对比分析,表明大型车辆分流方案的路段饱和度优于小汽车分流方案。

In order to measure the congestion and level of service of regional road networks after traffic diversion for freeway reconstruction quantitatively,the corresponding of traffic diversion and traffic diversion model with real-time feedback is proposed with overall saturation level as the constrict and optimal diversion performance as optimization function.Taking the reconstruction project of Tongguan-Baoji freeway as an example,two diversion programs are compared.This proposed method considered the loading level of traffic volume of diversion segments using the ratio of diversed traffic volume and capacity as the weights so as to describe the congestion condition of diversed regional road network.The analysis result shows it can reach the optimal diversion performance through this method and yield diversion balance.Based on the comparison of two diversion plans（large sized vehicle and small sized vehicle）,the result indicates that the sections of saturation in the car-traffic diversion plan is lower than that in the large vehicle-traffic diversion plan.4 tabs,1 fig,8 refs.