中文摘要：

鉴于Pacey提出的车队离散模型仅考虑红灯相位期间正在上游交叉口停车的排队车辆，这与实际情况明显不符。文章从交通流密度的角度，假设车速为在最小速度和自由流速度之间的截断正态分布，考虑它的红灯相位正在停车排队及红灯相位未停车而绿灯相位直接驶离的所有车辆，提出一种车速截断正态分布的车队离散模型。当信号灯由红变绿时，该模型可描述这部分车辆在下游道路行驶过程中的行驶过程，从而为下游交叉口的配时方案提供交通量数据基础。最后，以相邻交叉口信号协调控制为例，比较分析文中模型和Pacey模型的差异，验证了该模型的有效性。

英文摘要：

Pacey＇s platoon dispersion model considered only the dispersion characteristics of the queuing vehicles during the red phase at the upstream intersection, which does not properly reflect the field situation. By assuming the speed following truncated normal distribution ranging from a minimum speed to free flow speed, a platoon dispersion model to study the dispersion characteristics of platoon at the upstream intersection was developed from the view point of traffic flow density. The platoon contains all the vehicles, not only the queuing vehicles during the red phase, but also the running cars which can pass a upstream intersection during the green phase. The model describes spread of cars along the downstream road to provide traffic data for signal timing plans of the down- stream intersection as they move down from upstream intersection at red phase end time. Finally, numeric computation for coordination of successive signals is presented to illustrate the difference be- tween the proposed model and Pacey＇s model. The results confirm the validity of the proposed model.