快速路匝道与主线合流区交通参数关系模型

为了研究快速路匝道与其主线合流区的交通流特征关系，选用南京长江大桥入口作为数据 采集点，观测其汇入路段的交通流，并对交通流速度、密度等宏观参数和换道次数、可接受间隙等微观特征变量进行了相关性分析。研究发现，速度、密度、换道次数和可接受间隙之间存在非 线性相关性。基于此，构建了主线车道车速与密度、换道次数和可接受间隙之间的非线性关系模型。快速路匝道与主线合流区是快速路的主要瓶颈路段，结合宏观交通参数模型和微观间隙接受模型，阐述了快速路主线和匝道汇入车流的交通参数数学关系。实测数据拟合结果表明，该模型能够准确描述匝道与主线合流区的交通流特性。

Traffic Parameter Relationship Model for On-Ramp and Main Line Confluence Area of Expressway

In order to study the characteristics of expressway on-ramp and the main line confluence area, the entrance of the Nanjing Yangtze River Bridge was selected as the data acquisition area and the traffic observation was carried out. The correlation between the macro parameters such as traffic speed, density and the microscopic features variables such as the number of lane changing and acceptable gaps was analyzed. The results show that there are nonlinear correlations between speed, density, number of lane changing and acceptable gaps. Based on this, the nonlinear relationship model between the main lane speed and the density, the number of lane changing, the acceptable gaps was constructed. The onramp and the main line confluence area was the main bottleneck of the expressway. Based on the macro traffic flow model and the microcosmic gap acceptance model, the mathematical relationship between the traffic parameters of on-ramp and the main line confluence area of expressway was expounded. The fitting results indicate that the model can accurately describe the traffic flow characteristics of the onramp and main line confluence area.