When should a driver use their headlights?

Using headlights is crucial for maintaining visibility and safety under various driving conditions. The correct choice emphasizes that headlights should be used during darkness, poor visibility, or in bad weather. This guidance ensures that both the driver and other road users can see and be seen.

Driving with headlights on during darkness is essential as it enhances the driver's visibility to see the road ahead and objects or pedestrians that may be on or near the roadway. In conditions like fog, heavy rain, or snow, using headlights helps cut through the elements, improving the driver's ability to see and making the vehicle more visible to others, thereby reducing the risk of accidents.

The other options suggest limited use of headlights, which is not sufficient for safe driving practices. For example, using headlights only at night fails to address adverse weather conditions that can significantly reduce visibility at any time of day. Similarly, limiting their usage to only during rain overlooks scenarios like dusk or dawn when visibility may be compromised but is not necessarily categorized as nighttime. Lastly, suggesting headlights should only be used in good weather neglects the necessity for lights during instances of poor visibility regardless of the time of day.