Abstract: Complicated traffic flow in the expressway weaving area can easily cause traffic congestion, which has become the traffic bottleneck. The micro simulation about expressway weaving area composed of an off ramp, an on ramp, a main line lane and an assistant road was made through modeling, based on Cellular Automata (CA) NS model, and was carried out by setting car-following rules and lane-changing rules. The simulation shows the optimal reference value of the length of weaving area and the effect on traffic flow parameters, such as flow, density and velocity, and the simulation model was verified by the calculation result of HCM empirical formula.

Key words: Cellular Automata (CA), car-following rule, lane-changing rule, simulation model, length of weaving area

摘要： 城市快速路交织区由于复杂的交通流容易造成拥塞, 成为快速路交通的瓶颈。充分考虑到辅道交通流对交织区的影响，以元胞自动机NS模型为基础,通过设定跟车规则、换道规则,对一个包含入口匝道、出口匝道、主线车道和辅道的快速路交织区路网建立模型进行微观仿真。仿真得出交织区长度对流量、密度、速度等交通流参数的影响并给出了最优交织区长度参考值, 最后用HCM经验公式的计算结果验证了仿真模型。

关键词: 元胞自动机, 跟车规则, 换道规则, 仿真模型, 交织区长度