In order to improve the operating safety at tunnel entrance and exit zone, the alignment design at that zone was studied.
为提高公路隧道进出口区域的运行安全，对该区域的线形设计进行深入研究。
This product is mainly applicable to the tunnel: entrance section, change-over portion, basic segment and exit section.
本产品主要适用于隧道的：引入段、过渡段、基本段、出口段。
The sharp variation of luminance at the entrance and exit of highway tunnel will cause the difficulty in visual adaptation of the driver, and even lead to traffic accidents.
公路隧道进出口亮度的急剧变化会造成驾驶员视觉适应困难，严重时甚至导致交通事故。
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