When is it necessary to use headlights while driving?

Using headlights is essential when visibility is poor, which encompasses a variety of conditions such as rain, snow, fog, or nighttime driving. The primary function of headlights is to illuminate the road ahead and make the vehicle more visible to other drivers, which is crucial for ensuring safety during these low-visibility situations.

While some might think that headlights are only necessary at night or in specific weather conditions like fog, the law in many areas, including Washington State, requires drivers to use headlights in any conditions where visibility is compromised. This aligns with safe driving practices, as it helps both the driver and other road users see and react appropriately to each other.

In contrast, while it may be beneficial to use headlights during the daytime or on the highway, those are not strict requirements for all circumstances. It's the poor visibility conditions that specifically necessitate their use for maximum safety on the roads.