When should headlights be used?

The correct answer outlines the specific guidelines for using headlights to ensure safety while driving. Headlights should be utilized from half an hour after sunset to half an hour before sunrise, as this is when natural light diminishes and visibility is significantly reduced. Additionally, headlights are necessary in poor visibility conditions, such as during rain, fog, or snow, regardless of the time of day. This practice is crucial because it not only improves the driver's visibility but also makes the vehicle more visible to other road users, reducing the risk of accidents.

Using headlights only at nighttime might lead to unsafe driving during dawn or dusk when visibility is low, which could be dangerous. Operating them during daylight hours universally disregards conditions where they may not be necessary, such as on clear, sunny days. Lastly, using headlights only when other vehicles are around does not account for low visibility circumstances where they are needed for safe driving. The approach outlined in the correct answer promotes a proactive attitude toward road safety, ensuring that drivers are prepared for any reduction in visibility.