When should headlights be used according to California law?

Headlights must be used during fog, rain, or other low visibility conditions according to California law because they enhance visibility not just for the driver, but also for other road users. Using headlights in these situations helps prevent accidents by allowing a driver to see the road and obstacles more clearly while alerting other drivers to their presence. Additionally, California law specifies that headlights should be used whenever visibility is impaired to ensure safety on the road.

The other options do not capture the complete requirements of California law. While headlights are indeed necessary at night, relying solely on that condition overlooks other critical scenarios like adverse weather. Using headlights only on the freeway neglects the fact that they are needed on all roads under poor visibility. Lastly, stating that headlights are not required by law is inaccurate, as they are a vital component of safe driving.