When should headlights be turned on even during daytime?

The correct answer is that headlights should be turned on when visibility is less than 50 meters. This is crucial for safety, as reduced visibility due to factors like fog, heavy rain, or snow can significantly impair a driver’s ability to see other vehicles, pedestrians, and obstacles on the road. By turning on headlights in these conditions, not only does the driver enhance their own visibility, but they also make their vehicle more visible to others, which is critical for avoiding accidents.

In contrast, while headlights can be beneficial in rural areas, during highway driving, or in parking lots for improved visibility, the specific requirement for visibility under 50 meters directly addresses the safety protocol to warn drivers to achieve maximum visibility when conditions are compromised.