When are you required to use your headlights while driving in Washington State?

Answer: C — From sunset to sunrise and in low visibility conditions

You are required to use your headlights in Washington State from sunset to sunrise and in low visibility conditions, which includes situations such as fog, rain, or snow. The law recognizes that visibility can be significantly reduced at night and during adverse weather conditions, and using headlights helps improve the driver's ability to see the road and for other drivers to detect your vehicle. This safety measure is essential not only for your own visibility but also for the safety of other road users. Having your headlights on in low visibility conditions allows you to respond better to potential hazards and ensures you are more visible to others, reducing the risk of accidents.