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以云南小磨路K109+600～K122+024路段上的隧道群、陡坡与混行路段为试验样本路段,应用虚拟视景生成系统建立了路段三维静态与动态模型。在隧道内设置倒伏示警柱、视觉标线与常规标线3种中央隔离设施,在爬坡路段与混行路段上均设置附加车道,对比分析了3种路段上的平均车速与车辆平均横向位置,并评价了3种安全保障措施的效果。分析结果表明:在隧道内,3种中央隔离设施下的平均车速标准差分别为9.74、10.01、10.40 km.h-1,车辆平均横向位置标准差分别为0.54、0.70、0.69 m,说明设置倒伏示警柱后,车辆保持较好车速和横向位置;在爬坡路段上,当交通流量不超过1 000 pcu.h-1时,设置附加车道有利于主线路车辆车速的提高;在混行路段上,当非机动车流量分别为500、800 pcu.h-1时,设置附加车道后,车速增大,车速标准差减小,车辆横向位置变大,说明设置附加车道有利于提高和稳定车速,并可减少与对向车辆的冲突。
Taking tunnel groups, steep slopes and mixed road sections on K109 + 600 ~ K122 + 024 sections of Xiaomao Road in Yunnan as test sample sections, a three-dimensional static and dynamic model of road sections was established by using virtual visualization system. Three kinds of central isolation facilities such as warning post, visual marking line and conventional marking line are set in the tunnel. Additional lanes are set up on the hill climbing section and the mixed section, and the average speed and average lateral position of the three sections are compared and analyzed. , And evaluated the effect of three kinds of security measures. The results show that the average vehicle speed standard deviations of the three kinds of central isolation facilities are 9.74,10.01,10.40 km.h-1 and 0.54,0.70,0.69 m, respectively, in the tunnel, After the warning post, the vehicle maintains a good speed and lateral position; on the hillside, when the traffic volume does not exceed 1 000 pcu.h-1, setting an additional lane is advantageous for increasing the speed of the main line vehicle; on the mixed road section , When the traffic flow of non-motor vehicles is 500,800 pcu.h-1 respectively, the speed increases, the standard deviation of speed decreases, and the lateral position of the vehicle becomes larger after the additional lane is set. This shows that setting additional lanes helps to increase and stabilize the speed, And reduce the conflict with the opposite vehicle.