【摘要】 在NS模型的基础上,提出了一个高速公路双车道元胞自动机模型,考虑车辆超车换道行为,并设定发生交通事故的条件,以分析与衡量货运车辆对高速公路交通安全的影响。通过向交通流中混入不同比例的货运车辆,模拟了各种比例下的交通流运行状况,分析了货运车辆与平均速度、换道率、事故率等指标之间的关系。模拟结果表明,货运车辆会对高速公路交通流产生扰动作用,影响行车安全:随着货运车辆比例增大,交通流平均速度减小,换道率和事故率上升。更多还原

【Abstract】 A cellular automaton model for a two-lane highway was presented on the basis of NS model.Considering the lane changing behavior of vehicles and the possibility of accident at certain condition,this model was used to analyze the impact of freight vehicles on freeway safety.Through mixing different proportions of freight vehicles into traffic flow,the CA Model simulated the traffic conditions under various conditions,analyzed the relationship among freight vehicles and several indexes representing safety state,such as the running speed,lane change rate as well as accident rate.The result shows that freight vehicles can interfere traffic flow on freeways and impose threat on road safety: while the proportion of freight vehicles increases,the mean running speed decreases; however,the lane changing rate and accident rate go upward.更多还原