雨天高速公路手动-自动混行交通流仿真

Simulation of manual-automatic mixed traffic flow on rainy highways

为提高雨天行车安全性,以高速公路为研究对象,分析自动驾驶车辆参与的混行交通流在晴天、小雨、中雨、大雨的驾驶行为,建立雨天单向双车道高速公路混行交通流模型,通过模拟仿真对交通流特性及事故率进行分析。结果表明:晴天、小雨、中雨、大雨时,自由流最大速度为119.27 km·h^(-1)、108.5、88.0 km·h^(-1)和70.3 km·h^(-1),随着渗透率变大临界平均密度逐渐变小,在不同天气渗透率为20%、50%和80%时,平均换道次数为421.5、631.75和966.75;在渗透率为0时,不同密度下4种天气的平均事故率为2.45%、2.75%、3.56%和4.70%;渗透率达到60%以后,随着渗透率的增大,对降低事故率的效果更加显著。

In order to improve driving safety in rainy days,taking expressway as the research object,the driving behavior of mixed traffic flow in which autonomous vehicles participate in sunny days,light rain,moderate rain and heavy rain was analyzed,and a one-way two-lane expressway mixed traffic flow model was established in rainy days.The traffic flow characteristics and accident rate were analyzed through simulation.The results show that:under sunny weather,light rain,moderate rain and heavy rain,the maximum free flow velocity is 119.27,108.5,88.0,and 70.3 km·h^(-1).With the increase of permeability,the critical average density gradually decreases.When the permeability is 20%,50%,and 80%in different weather,the critical average density decreases gradually.The average lane change times were 421.5,631.75 and 966.75.When the penetration rate is 0,the average accident rate of four kinds of weather under different density is 2.45%,2.75%,3.56%and 4.70%.After the permeability reaches 60%,with the increase of the permeability,the effect of reducing the accident rate is more significant.