信号交叉口自行车对左转机动车饱和流率的影响研究

In order to analyze the conflict of bicycles and left-turn vehicles, this paper uses bicycles at signalized intersection as objective of research, through the study of the different states of bicycles crossing an intersection; this paper divides the conflicts of bicycles and vehicles into two cases to consider. In the first case, the conflicts of left-turn vehicles and the bicycles which are initially release by green light are taken into consideration, the paper studies occupation rate of bicycles in conflict zone to analyze the effect of bicycles in this case. In the second case, the paper considers the conflicts of vehicles and free-arrived bicycles, and uses theory of critical gap to analyze, finally it gets saturation flow reduction factor for left-turn vehicles. The result of this study can supply the content about calculating method of vehicle capacity at intersection in HCM2000 and provide the basis for design of intersection signal timing program and capacity calculation of capacity under the condition of mixed traffic at intersection.