基于CA的短时交通事件干扰下的交通流仿真

公路上发生短时交通事件时,会对公路上的交通流产生干扰。利用元胞自动机（cellular au-tomata,CA）建立单向双车道高速公路模型。通过CA对发生短时交通事件后的区域进行划分,提出事件下游区域、核心区域、上游区域的CA模型,并构建焦虑换道、急切换道、理性换道规则。最后用MATLAB软件对短时交通事件干扰下的高速公路交通流进行仿真。结果表明,在低、高密度交通流的情况下,相同事件对交通流的干扰存在一定差异,在排队时间、最大排队长队、平均排队长度上均有所不同。

CA-based Simulation of Traffic Flow under the Disturbance of Short-term Traffic Incident

When a short-term traffic incident takes place,it usually has a significant impact on the traffic flow.At first,a model based on cellular automata（CA） is developed for a two-lane divided freeway to study such an impact.Secondly,the event areas of the CA model are further divided into the following： downstream area,central area,and upstream area;and several rules for the CA model are also proposed,such as those for lane change under stress,urgent lane change and rational lane change.Finally,the CA model is simulated by using MATLAB to study the freeway traffic flow under the disturbance of short-term traffic incident.Study results indicate that depending on whether the density of traffic flow is low or high,the impacts of the disturbances from the same incident are found different and the queuing time,the maximum queue lengths and the average of queue lengths of the two scenarios are also different.