When must headlights be used?

Headlights must be used from sunset to sunrise and whenever visibility is poor. This requirement is in place to ensure that drivers can see the road and any potential hazards clearly, as well as to make their vehicle visible to other drivers. Poor visibility can be caused by a variety of factors such as rain, fog, snow, or dust, necessitating the use of headlights to enhance safety for everyone on the road. This rule is critical for preventing accidents and ensuring good communication between vehicles, particularly in conditions where distance visibility is compromised.

The other choices do not capture the full context of when headlights should be utilized for safety. Restricting headlight use to only daylight hours ignores the need for visibility in poor weather conditions at any time of day. Using headlights only after passing another vehicle does not address the necessity for visibility during low light situations, while stating they must be used on highways overlooks their essential role in everyday driving scenarios, regardless of road type.