Tunnel lighting can improve the road condition inside the tunnel, improve visual enjoyment inside the tunnel, reduce driver fatigue, and help improve the tunnel's traffic capacity to ensure traffic safety. The implementation of tunnel lighting control schemes relies on the support of advanced control technology and control methods. The tunnel lighting control method largely reflects the modernization of tunnel operation and management. The tunnel lighting system is equipped with lighting control truss/distribution box, which can achieve on-site manual and automatic control, and a remote control module is reserved to provide relay contacts for controlling lighting facilities. The lighting area control unit is directly connected to the relay contacts of the lighting control cabinet/distribution box to achieve remote control of lighting facilities. There are several ways to control tunnel lighting: ① manual control method. It refers to tunnel management personnel manually selecting control schemes based on parameters such as brightness outside the tunnel and traffic volume. Specifically, it is based on changes in factors such as brightness (S) outside the cave, traffic volume, average vehicle speed, and weather conditions. The manual control of the lighting circuit on/off or stepless regulation of lighting brightness by highway tunnel management personnel can be divided into remote manual control mode and local manual control mode. In the early days, local manual control methods were mostly used for highway tunnels with shorter lengths and simpler operation and management Automatic control mode. It refers to the automatic regulation of lighting brightness by the lighting control system based on real-time collected parameters such as brightness outside the tunnel and traffic volume. The automatic control of tunnel lighting utilizes relevant lighting control parameters that are not collected by brightness detectors, vehicle detectors, etc., and is directly controlled by electronic devices to turn on/off the lighting circuit or infinitely regulate the lighting brightness, without the need for manual participation in the control process. It can be divided into remote automatic control mode and local automatic control mode. Under automatic control mode, the tunnel lighting control system automatically adjusts the lighting brightness inside the tunnel based on the H-inch collected lighting control parameters such as brightness outside the tunnel (S), traffic volume, and average speed; Tunnel management personnel can also switch from automatic control mode to manual control mode based on actual operation and management situation, and switch to manual operation. This control method has been adopted in foreign countries as early as the 1980s, and most highway tunnels in China also adopt lighting control methods with automatic control as the main control and manual control as the auxiliary
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