Under what conditions should you use low-beam headlights?

Using low-beam headlights is particularly important in fog and heavy rain conditions. This is because low beams reduce the amount of light that reflects off the precipitation back into the driver's eyes. In foggy or rainy conditions, high-beam headlights can create a blinding glare, making it difficult to see. Low beams help provide adequate visibility without causing excessive glare, ensuring that the driver can see the road and that other drivers can see the vehicle.

While it may be beneficial to use low beams in city driving, the need is more significant in adverse weather conditions where visibility is greatly reduced. During the daytime, using headlights is typically unnecessary unless visibility is extremely poor. On poorly lit highways, low beams are appropriate, but the focus here is on conditions like fog and heavy rain where visibility is critically impacted.