驾车接近隧道过程中驾驶员的适应亮度变化规律

在驾车接近隧道过程中,驾驶员的适应亮度随视野内景物的变化而变化。基于驾驶员视觉适应进行隧道照明设计需要掌握驾驶员在接近隧道过程中适应亮度的变化规律,为此,以4座隧道为测试对象,对驾驶员在不同时段驾车接近隧道过程中距隧道一个停车视距内不同位置处的适应亮度进行了实测研究。结果发现,驾驶员在不同测试时段接近同一隧道过程中,其适应亮度变化规律基本相似;驾驶员在接近隧道的过程中,适应亮度逐渐降低,但其适应亮度的降低不是线性的,从驾驶员距隧道洞口20~30m开始,适应亮度下降的速率变大。

Drivers' adaptation luminance changing rule when driving into tunnels

Drivers'' adaptation luminance changes with the changing of the sense within their visual field when they drive into tunnels. Tunnel lighting design should provide brightness levels in accord with drivers'' visual adaptation; so, it is necessary to find out drivers'' adaptation luminance changing rule when driving into tunnels. For this purpose, we took four tunnels as the research objects, and measured and calculated drivers'' adaptation luminance at different positions within a stopping sight distance to the tunnel entrances. The results indicate that drivers'' adaptation luminance changing rule is similar when they drive into the same tunnel at different time. Drivers'' adaptation luminance decreases gradually when they drive into tunnels, but the decrease is nonlinear, and drivers'' adaptation luminance decreases fast when they are in the distance of 20 m to30 m from the entrance of a tunnel.