交叉口渐变段线型研究与函数模型构建

Study and Modeling of Geometric Design Features of Taper Lanes at Intersections

减少事故发生、合理的渐变段长度及线型设计,能改善交叉口的通行环境、保障车辆安全行驶、提高路口整体的通行能力.在参考美国关于城市道路交叉口设计相关资料的基础上,对比我国现有城市道路交叉口设计相关技术规范的欠缺之处,结合我国交通参与者实际行车习惯,提出一种符合我国驾驶员驾驶习惯的渐变段线型及其函数模型.通过对现场交叉口车辆进行航拍得到车辆运行轨迹,再将轨迹坐标化,带入Matlab和Spss进行数据拟合,得到交叉口渐变段线型,最终对渐变段线型函数构建,并对模型进行参数标定与简化,使其有利于工程实际计算,为我国城市交叉口渐变段设计提供较为合理的参考.

In the face of the current urban traffic situation in China,a reasonable design of taper lanes at the intersection can effectively ensure the safe driving of vehicles and reduce crash occurrence.Proper geometric design of the taper lanes can effectively improve the traffic environment of the intersection and improve the overall capacity of the intersection.This research has analyzed the relevant data on the design of urban road intersections in the United State,identified the gaps in relevant technical specifications of existing urban road intersection designs in China,and proposed a model to design taper lanes to accommodate the actual driving habits of Chinese drivers.The vehicle trajectory is obtained by aerial photography of vehicles at the intersection,and then the trajectory is coordinated and brought into Matlab and SPSS for data fitting to obtain the gradient line type of the intersection.Finally,the linear function of the tapaer lanes is constructed,and the model is calibrated and simplified,which is conducive to the actual calculation of the project and provides a reasonable reference for the design of the taper lanes of urban intersections in China.