基于CarSim仿真的公路车道数变化段指标研究

Study on the index of highway lane changing section based on Car Sim simulation

针对公路车道数变化处过渡段的长度或渐变率设计指标的取值对于安全行车具有重要影响,通过分析公路车道数变化处过渡段车辆行驶需要换道特点,提出一次函数修正型正弦曲线换道模型,并建立基于车辆换道轨迹的车道数变化处过渡段渐变率计算模型。通过换道轨迹模型中特征参数的分析,确定不同设计速度与超高横坡情况下车辆换道的横移宽度与纵向移动距离,进而提出车道数增加或减少一个时,过渡段的长度和渐变率推荐值。研究结果表明:车道数变化过渡段的长度和渐变率不仅与设计速度相关,且与超高横坡有关。提出的过渡段长度和渐变率的建议值可为今后公路车道数变化过渡段的设计提供参考。

The length of width transition section and the value of the gradient index design of the highway lanes number changing have important influence on the safety driving.Through the analysis of the vehicle lane number changing characteristics of highway lanes number changing at width transition section,this paper proposed a modified sine curve of lane changing model and established a gradient calculation model of width transition section based on the lane changing trajectory of lane number changing.Through the analysis of characteristic parameters for trajectory model,the lateral movement moving width and longitudinal movement distance of vehicle different design speed and super cross slope are identified,and then put forward width transition length and transition ratio recommended value when the number of lanes is increased or decreased by one.The research results show that the length and transition ratio of width transition section of the lane number changing are not only related to the design speed,but also related to the superelevation cross slope.The proposed value of width transition length and gradient can be used as a reference for the design of width transition section of highway lane number changing in the future.