Abstract: In order to study the difference characteristics of driver′s driving workload between highaltitude area and plain area to obtain the tunnel lighting brightness requirements applicable to highaltitude area, and provide the theory, method and technical basis for objectively quantifying the design and management standards of highway tunnel lighting in highaltitude area, a quantitative study is carried out in the actual vehicle test of Jiangxi Yi′an secondclass highway and QinghaiTibet secondclass highway with similar road operation conditions from the perspective of driving safety, stability and comfort based on the driver′s driving workload theory. The tests and conclusions are drawn as follows: (1) By using CART to analyze the data from field driving test, it is found that there is a positive correlation between the altitude and the normal driving workload of drivers, i.e. the driving demand and driving workload of drivers at altitude of 4 300~4 400 m are the highest, followed by that at altitude of 3 200~3 300 m, and that at plain area are the lowest. (2) The driver′s driving workload can be modified according to the altitude, and the correction coefficient and the threshold of driving workload degree are obtained. (3) The correction coefficient of tunnel lighting recognition demand relative to plain area in highaltitude area is proposed, which is 1.2 at altitude of 3 200~3 300 m and 1.8 at altitude of 4 300~4 400 m. (4) The design standards of lighting brightness for each characteristic section of highway tunnel at different altitudes are obtained.

Key words: high altitude area, tunnel lighting, recognition demand, driving workload, threshold of driving workload degree, tunnel lighting brightness standard