考虑坡道的元胞自动机交通流模型研究

Research on cellular automata model based on slope

为了更好地研究坡道交通流的特征,基于Gipps安全驾驶的思想,考虑了坡道长度和纵坡度等因素,建立了一个新的更为精细的坡道交通流元胞自动机模型,并通过计算机数值模拟,对坡道交通流特征进行了分析。发现坡道加剧了道路的拥堵,而且拥堵流和自由流之间存在一条十分明显的分界线,冲击波传递到分界线时发生了消散。此外,在最大通行能力附近,交通流密度—流量曲线会在一定坡道长度范围内(如40<Lp<80)进行集聚,坡道长度在这个范围对通行能力的影响相接近。坡道的纵坡度相对于坡道的长度而言,对道路的通行能力影响更为明显。

In order to better the study of the slope traffic flow characteristics based on the idea of Gipps safe driving,considering the factors such as the length of the slope and the vertical gradient of the slope,this paper established a new more sophisticated slope traffic cellular automaton model,and used computer simulation to analyze the slope traffic flow characteristics.Got new findings as follows: the slope exacerbated the road congestion,there was a very clear dividing line between the free flow and congestion flow,shock waved dissipate when delivered to the line. In addition,near the maximum traffic capacity,it gathered traffic density-flow curve within a certain length( e. g. 40 < Lp < 80),the slope length in the range had the similar impact on the traffic capacity. Compared with the slope length,the vertical gradient of the slope has more obvious impact on the road capacity.