What is the legal requirement for headlights in rainy conditions?

Using headlights anytime you use your windshield wipers is a legal requirement in rainy conditions. This regulation enhances visibility for both the driver and other motorists on the road. When windshield wipers are activated, it indicates that visibility conditions may be compromised due to rain, fog, or other weather conditions, necessitating the use of headlights to improve safety. By using headlights, drivers make themselves more visible to others, reducing the risk of accidents.

In contrast, the other options do not align with California traffic laws. Headlights are not limited to nighttime use; rather, they must be employed during low visibility conditions regardless of the time of day. Additionally, headlights are not optional in rain; they are a critical safety feature for conditions that impair vision. The requirement for headlights is not restricted to heavy rain but applies as soon as windshield wipers are in use, reinforcing the need to maintain visibility at all times when conditions are poor.