What is the official reason that drivers may flash their headlights at you?

Flashing headlights is commonly used as a signal to warn other road users of a vehicle's presence, particularly in situations where visibility may be compromised. For instance, if a driver is approaching a junction or a bend in the road, flashing headlights can alert oncoming vehicles to their proximity, helping to prevent potential accidents. This practice is seen as a courteous and safe measure to ensure mutual awareness among drivers, especially at night or in adverse weather conditions where visibility is limited.

The intent behind this signal is to communicate with other drivers to enhance safety on the roads. Proper understanding of this communication can help prevent misunderstandings or unsafe situations. While other reasons for flashing headlights exist, such as signaling an intention to overtake or indicating a hazard, the primary official reason recognized in driving guidelines pertains to the warning of presence, particularly in contexts of reduced visibility or complex road layouts.