Overdriving your headlights means not being able to stop inside the illuminated area ahead. It is difficult to judge other vehicles' speeds and distances at night. Do not overdrive your headlights—it creates a blind "crash area" in front of your vehicle. You should be able to stop inside the illuminated area ahead.

What does it mean if you are overdriving your headlights?

It is often called 'overdriving your headlights' when a driver's visibility is limited due to fog or darkness, but the driver still drives at a speed which does not allow them the ability to stop in time to avoid obstacles in the road.

Why should you flash your headlights?

Headlight flashing can let other drivers know of one's presence. Flashing can acknowledge the presence or actions of other drivers. ... Flashing can warn other drivers of road dangers, such as crashed cars or police speed traps. Flashing can be used to give thanks.