When is it permitted to use the horn of your vehicle?

Using your vehicle's horn is primarily a safety measure designed to alert other drivers or pedestrians of potential danger. It is permitted when you reasonably believe that safety may be compromised. For example, if another driver is drifting into your lane or a pedestrian is about to step into traffic, using the horn can help avoid an accident by drawing attention to the situation.

The other scenarios do not justify the use of the horn. Honking when you're angry can escalate situations and is often considered road rage, which is not acceptable behavior. Using the horn simply to greet someone can be distracting and is not appropriate in traffic situations. Additionally, while the horn can indeed be used in emergencies, the broader principle is that it serves as a warning in any situation where safety is at risk, not limited solely to emergencies. Therefore, the emphasis on reasonable belief concerning safety captures the essence of proper horn use on the road.