中文摘要：

交通流组成中的大型车比例是城市道路机动车速度-流量关系建模的重要影响因素,以往研究成果对此考虑不够。以四幅路和三幅路为对象,在大量实测数据基础上采用双因素方差分析法表明机动车流量和大型车比例均对车流速度产生显著影响。由BPR模型拓展得到各类道路速度-流量模型的通用形式,进而利用实测数据从统计学角度进行变量筛选和参数标定,最终建立各类道路不同大型车比例下的机动车速度-流量模型。该模型既可服务于宏观交通流分析,又可以为制定城市道路大型车限行或分流措施等提供参考。

英文摘要：

The proportion of heavy vehicles to the total traffic flow has a significant impact on the modeling of the speed-flow relationship,which has received little attention in the literature. According to the field data from those roads with three or four vehicle tracks on which motor vehicles and none-motor vehicles are physically separated,this study utilized the method of two-factor variance analysis to prove that both the flow and the proportion of heavy vehicles significantly affect the speed. A general speed-flow model for all types of roads mentioned above was extended from the BPR model,and then the variables were selected and the parameters were calibrated by field data. Thus the speed-flow models for different types of roads and different levels of heavy vehicles proportions were established. The proposed models can serve the macro-scope traffic flow analysis and the decision-making for restriction or diversion of heavy vehicles on urban roads.