匝道布置与设计对快速集散道路通行能力影响
Effect of ramp layout and design on capacity of distributed expressway

为探究匝道布置与设计对城市快速集散道路通行能力的影响，对比城市快速集散道路与高速公路和快速路在匝道布置特征上的不同，根据匝道的出入顺序和车道平衡设计划分4类共8种匝道布置型式；采用微观仿真方法，以速度和匝道间距作为指标进行交叉分类，通过寻找交通流三参数的关系，就匝道布置与车道平衡设计对城市快速集散道路通行能力的影响进行分析，进一步提出适用城市快速集散道路的匝道间距参考值。研究结果表明：不同的匝道布置模式使得城市快速集散道路的交通运行状态差异很大，匝道间距、限速措施和车道平衡设计也对通行能力有不同程度的影响。
In order to explore the influence of ramp layout and design on capacity of distributed expressway, this paper contrasts the difference characteristics of Highway, Urban expressway and distributed expressway in ramp layout. According to the sequence of on/off ramp and lane balance design, the 4 large classes and 8 subclasses of ramp layout type were classified. Based on microscopic simulation method, and taking speed and ramp distance as cross classification indicators, the effects of ramp layout and design on capacity of distributed expressway were analyzed on the basis of the relationship of parameters of traffic flow. Finally, new ramp distance value which is suitable for the distributed expressway was proposed. The results show that the traffic flow state has a remarkable difference in distributed expressway at different ramp layout models. Ramp distance, speed limit measures and lane balance design also affect the capacity to some degrees