双车道二级公路直曲衔接段车辆运行速度变化研究

摘要

In the road geometric design process,speed variation along the road segment is one of the most pop-ular criteria to evaluate the road consistency,hence it is important to estimate the operating speed and its vari-ations.By studying the behavior of vehicle driving at curves on the secondary roads,the variation of vehicle speed is obtained and the model to predict acceleration and deceleration rates is built.The desired driving path and the actual driving path of the vehicle under different circumstances are analyzed and the effect of drivers on vehicle paths is studied with the driver information.Thus it can provide a theoretical basis for the improve-ment of road alignment design evaluation technology.%在道路线形设计中，路段间运行速度差是作为评价道路线形与行车安全的重要指标之一，准确地获取路段间运行速度变化十分重要。文中通过测取车辆在二级公路直曲衔接段上连续运行速度，研究车辆在二级公路中弯道处的驾驶行为，得出车辆在弯道处的速度变化规律，进而建立加速度与减速度预测模型；对比分析直曲衔接段单独车辆的速度变化85％统计值（Δ85V）与直曲两路段间85％速度统计值的差值（ΔV 85）间的关系，发现ΔV 85存在低估车速变化的情况，从而为线形设计评价方法的改进提供依据。