Where:
On any road, especially in mountainous areas or before entering a tunnel.
May also appear in areas with poor visibility, such as fog-prone zones, shaded roads, or during adverse weather conditions

Purpose:
To indicate that drivers must switch on their vehicles headlights.
Ensures that your vehicle is visible to other road users and that you can see the road clearly in areas with reduced lighting or visibility.
Enhances road safety, particularly in tunnels, sharp bends, or mountainous terrain.

Action:
Switch on your vehicle lights in the dipped/headlamp position (not full-beam) unless otherwise indicated.
Check that all lights are functioning correctly, including front and rear lights.
Reduce speed if visibility is limited and remain alert for other vehicles, cyclists, or pedestrians.
Do not switch off your headlights until it is safe and visibility has returned to normal.