为解决山区高速公路（特）长隧道及隧道群路段长时间跟车影响安全性、运行效率的发挥，同时为提高驾驶舒适性与驾乘体验，对云南省高速公路隧道数量和典型隧道可换道位置分布情况进行统计，重点针对已运营的保泸高速老营特长隧道、大丽高速花椒箐特长隧道及楚大高速九顶山特长隧道进行调研分析。根据交通流状况、线形指标条件、事故分布、驾驶需求等情况，结合实车驾驶试验观测与驾驶模拟仿真，开展隧道内可变道最小长度，隧道出入口段禁止变道白色实线长度及隧道群路段可变道路段布设等研究，得出隧道内允许换道的条件： 特长隧道车道间，宜设置白色虚线允许变道；长隧道车道间，可设置白色虚线允许变道；中隧道车道间，宜设置白色实线禁止变道；短隧道车道间，应设置白色实线禁止变道；螺旋隧道，宜设置白色实线禁止变道。隧道内白色虚线的长度应不小于249 m，宜不小于399 m；2座隧道间距≥400 m时，隧道间可设置白色虚线允许变道。

To minimize the impact of long-term following on safety and operational efficiency in long (extralong) tunnels and tunnel groups on mountain expressway, and to improve travelling comfort and experience, the authors conduct statistical analysis on number of highway tunnels and the distribution of typical tunnel lane changing schemes in Yunnan province, China. Then, investigations and analyses are conducted on the Laoying extralong tunnel of the Baoshan-Lushui expressway, the Huajiaoqing extralong tunnel of the DaliRuili expressway, and the Jiudingshan extralong tunnel of the ChuxiongDali expressway. Based on traffic flow, linear indicator, accident distribution, and driving needs, the minimum length of variable lanes in tunnels, the white solid line length of prohibited lane changes at tunnel entrances and exits, and the layout of variable lane sections in tunnel group sections are examined using real vehicle driving test and driving simulation. The conditions for allowing lane changes within the tunnel are as follows: (1) The white dashed lines should be set between the lanes of extralong tunnels to allow lane changes, white dashed lines can be set between the lanes of long tunnels to allow lane changes, white solid lines should be set between the lanes of the middle tunnel to prohibit lane changes, white solid lines must be set between short tunnel lanes to prohibit lane changes, and spiral tunnels should be equipped with white solid lines to prohibit lane changes. (2) The length of the white dashed line in tunnel must not be less than 249 m and should not be less than 399 m, and when the distance between two tunnels is no less than 400 m, white dashed line can be set between the tunnels to allow lane changes.