基于驾驶模拟技术的山区高速公路桥隧群区限速值分析

Analysis of Speed Limit Value in the Group Area of Bridges and Tunnels on Mountainous Expressway based on Driving Simulation Technology

为了提高山区高速公路行车安全性和速度连续性,提出了山区高速公路桥隧群区路段的限速值优化方法。首先通过选择在建的山区高速公路桥隧群区段为研究对象,构建了该路段的三维仿真场景。然后根据隧道路段设计速度采用标准,分别确定了"设计速度±20 km/h"和"设计速度"等3种限速方案,开展了3种限速方案下的驾驶模拟实验。最后从运行安全性、行车舒适性和效率性出发,选取了横向偏移值、相邻路段运行速度差、纵向加速度和速度统计指标,分析了不同限速方案下驾驶响应特性。结果表明:较低限速方案下,车辆横向偏移量最小,限速提高使得车辆更难以保持轨迹一致性,增加了行车安全风险,但合适的限速条件下,车辆运行速度变化和纵向加速度控制更平顺,有利于行车安全性和舒适性;采用线形累加法进行综合评价,认为采用设计速度的限速条件能较好均衡桥隧群区的安全性、舒适性和通行效率。

In order to improve the driving safety and speed continuity of mountain expressway, the optimization method of speed limit value in the bridge-tunnel group area of mountain expressway is put forward. Firstly, a 3 D simulation scene is constructed by selecting the bridge-tunnel group section of mountain expressway under construction as the study background. Then, according to the design speed standard of the tunnel section, three speed limit schemes of "design speed ±20 km/h" and "design speed" are determined respectively, and driving simulation experiments under the three speed limit schemes are carried out. Finally, from the perspective of operating safety, driving comfort and efficiency, the driving response characteristics under different speed limit schemes are analyzed by selecting the lateral deviation value, the running speed difference between adjacent sections, the longitudinal acceleration and the statistical indicators of speed. The results show that: under the lower speed limit scheme, the lateral offset of the vehicle is the least, and the increase of the speed limit makes it more difficult for the vehicle to maintain the trajectory consistency, which increases the driving safety risk. However, under the appropriate speed limit condition, the vehicle running speed change and longitudinal acceleration control are more smooth, which is conducive to driving safety and comfort. The linear accumulation method is used for comprehensive evaluation, and it is considered that the speed limiting condition of design speed can balance the safety, comfort and traffic efficiency of the bridge-tunnel group area.