If a car ahead on a dual carriageway shows its hazard lights briefly, what does it indicate?

When a car on a dual carriageway activates its hazard lights briefly, it typically signals to other drivers that there is a potential hazard ahead. This warning is particularly important in situations where traffic may be slowing down or stopping suddenly due to various reasons, such as an accident, road obstruction, or other unforeseen circumstances. The use of hazard lights serves as a visual cue to alert drivers behind the vehicle to reduce their speed and exercise caution.

In contrast, while hazard lights can indicate issues with a vehicle, parking, or lane changes in other contexts, such usage in this specific situation—when applied briefly on a dual carriageway—most clearly communicates an immediate concern about the traffic flow ahead. Thus, understanding this signaling is crucial for maintaining safety on the road and preventing accidents.