交通流三段式模型理论研究

车流密度、行车速度和交通流量是反映交通流特征的三个基本参数,三者关系的确定和模型的建立是交通工程理论研究的基础。这里在总结前人研究成果的基础上,从交通流的本质特征入手对车流密度与行车速度的关系进行了深入研究,建立了三段式密度-速度理论关系模型,并由此进一步讨论了交通流量与行车速度、交通流量与车流密度之间的理论关系,建立了相关模型,各关系模型图示形状与实测结果的曲线有较好的吻合。这里明确指出了格林希尔茨模型缺陷的本质所在,对交通流三段模式的产生机理进行了探讨。

Study on Three Traffic Flow Parameters

Traffic flow, vehicle speed and traffic flow density are three basic parameters which can be used to describe traffic flow characteristics. The relationships and models among them are the foundations of traffic engineering research. Starting from the basic characters of traffic flow, the theoretical formulas of the relationships between traffic flow density and vehicle speed were deduced and three-phase density-speed theoretical relationship model was established. Then, the theoretical formulas of the relationship between traffic volume and vehicle speed, traffic volume and traffic flow density were also discussed and some relative models were set up. The results showed that the formulas were in accordance with the curves of field survey results.