Analysis of impact of heavy vehicles proportion upon modeling speed-flow relationship on urban roads

作者：Ren Gang^*; Liu Xiaoqing; Quan Linhua

来源：China Civil Engineering Journal, 2010, 43(2): 133-137.

• Flow model
• Heavy vehicle
• Heavy vehicles proportion
• Traffic Engineering
• Urban road
• Variance analysis

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.

• 出版日期2010
• 单位东南大学