When should dipped headlights be turned on while driving through a tunnel?

Dipped headlights should be turned on when visibility is less than 200 meters while driving through a tunnel because this ensures that your vehicle is clearly visible to other drivers and improves your own ability to see the road and potential hazards. The inside of a tunnel can create unique lighting conditions where the transition from bright outdoor light to the dark of the tunnel can affect visibility dramatically. By using dipped headlights in these circumstances, drivers can enhance safety by ensuring that both they and other road users are visible in lower light conditions, reducing the likelihood of accidents.

Using dipped headlights creates a clear visual signal to others and helps to navigate potential dangers such as obstacles, other vehicles, or changes in the road. This practice aligns with driving regulations aimed at promoting safety in low-visibility environments. In contrast, keeping headlights off when visibility is better than 200 meters or not using them at all could result in decreased awareness and increased risks on the road.