改进的双向两车道混合交通流模型

摘要

在已有双向两车道混合交通流模型基础上,通过考虑取消对低速车队列的限制,并引入转道车辆邻道后方安全距的新概念,提出一种新的双向交通流元胞自动机模型.数值模拟改进模型的交通流基本图,并进行对比.模拟结果表明,改进的模型表现出新的特性,混合交通流中,慢车的出现、两车道初始密度不均匀分布对双向交通流都有显著的影响.%On the basis of available two-way two-lane hybrid trafic flow model, a novel cellular automat model for two-way traffic flow was proposed, where the restriction on low-speed vehicle queue was canceled and a novel concept of longitudinal security gap between the lane-changing vehicle and the one on the adjacent lane was introduced. The fundamental graph of traffic flow of the improved model were numerically simulated and compared to that of the original model. The simulation result showed that a new feature was manifested in the improved model; in hybrid traffic flow, both the emergence of slow cars and non-uniform distribution of car density on two lanes would have remarkable influence on two-way traffic flow.