1. Basic lighting
Tunnel interior lighting: Provide sufficient light for vehicles and pedestrians to ensure safe passage, especially in long tunnels or areas with insufficient light.

Entrance and exit lighting: Set up gradient lighting at the entrance and exit of the tunnel to help drivers adapt to changes in light and avoid the "black hole effect" or "white hole effect".

2. Safety lighting
Emergency lighting: Provide lighting in power outages or emergencies to ensure safe evacuation of personnel.

Evacuation instructions: Install emergency indicator lights and evacuation signs to guide personnel to evacuate quickly.

Obstacle lighting: Set up warning lights at obstacles or construction areas in the tunnel to remind drivers to pay attention.

3. Intelligent lighting system
Automatic dimming: Automatically adjust the lighting brightness according to the light intensity inside and outside the tunnel to save energy.

Traffic flow sensing: Monitor traffic flow through sensors, dynamically adjust lighting intensity, and reduce energy waste.

Remote monitoring: Real-time monitoring of lamp status through intelligent systems, timely detection of faults and maintenance.

4. Energy saving and environmental protection
LED lamps: LED lamps are widely used because of their energy saving, long life and high brightness, which are suitable for long-term lighting in tunnels.

Solar lighting: Install solar lamps near the entrance or exit of the tunnel to further reduce energy consumption.

5. Special lighting
Fog lighting: Use special wavelengths of light (such as yellow light) to improve visibility in foggy days or when visibility is low.

Decorative lighting: Install decorative lights on the inner wall or top of the tunnel to enhance the aesthetics of the tunnel and driving experience.

6. Maintenance and management
Regular maintenance: Regularly check lamps and circuits to ensure the normal operation of the lighting system and avoid safety hazards caused by failures.

Remote control: Real-time adjustment of lighting parameters through remote control systems to improve management efficiency.

7. Traffic guidance
Lane indication lighting: Indicate lane direction through ground or wall lights to help drivers maintain the correct driving route in complex tunnels.

Signal light linkage: Link with the traffic signal light system to ensure smooth and safe traffic in the tunnel.

Summary
The application of lights in tunnels not only provides basic lighting, but also involves many functions such as safety, energy saving, and intelligent management. It is an important facility to ensure tunnel traffic safety and improve traffic efficiency. Through reasonable design and advanced technology, tunnel lighting systems can effectively improve driving experience and reduce operating costs.