When should low beams be turned on in relation to approaching another vehicle?

The appropriate time to turn on low beams in relation to approaching another vehicle is when daylight fades. This is critical for maintaining visibility without dazzling other drivers. Low beams are designed to provide sufficient illumination of the roadway ahead while minimizing glare for oncoming traffic. When daylight begins to diminish, whether during early evening or in cloudy conditions, it's important to switch to low beams to ensure that both you and other drivers can see clearly and safely navigate the road.

While entering a city, driving on a gravel road, and before entering a highway can be situations where low beams might also be necessary, none are as directly tied to the concept of approaching another vehicle in low-light conditions as the fading daylight scenario. Proper use of headlights increases safety on the road, particularly during times when visibility is compromised.