Tunnel lighting refers to the basic lighting in the tunnel and moderate lighting near the entrance. Basic lighting is the minimum lighting standard in the middle of the tunnel to ensure the safety of vehicles and pedestrians passing through the tunnel at the design speed. When the driver suddenly enters the dark field from the bright field, the visual function has an adaptation process. In order to ensure the continuity of visual function, shading measures should be taken between the connecting hole outside the hole and the approach road of the driver's vision during the day, and the length of the connecting hole inside the hole should be properly illuminated. At the same time, there should be a limit for the brightness change rate of the approach road and transition section in the cave to ensure visual continuity and excessive dark adaptation. The length of relaxed lighting section depends on the product of stopping sight distance or driver's dark adaptation time and design speed.

Emergency facilities in tunnels refer to all kinds of facilities set up to prevent greater secondary disasters when catastrophic accidents occur in tunnels. Such as notification devices, emergency alarm devices, fire fighting equipment and other facilities. The notification device enables the accident discoverer to report to the site or the nearby tunnel management station immediately; The emergency alarm device can send emergency signals to drivers of vehicles behind and opposite; Fire fighting equipment refers to fire extinguishers, fire hydrants and spraying equipment installed in the tunnel; Other facilities include guidance equipment, standby power supply and monitoring TV. Emergency facilities are expensive, only those important long tunnels are considered, and the traffic volume is large.