When can you use your horn legally?

Using your horn legally is primarily intended for safety purposes, especially to alert other drivers of your presence. This is crucial in situations where visibility is poor or when you believe another driver may not see you, such as in merging lanes or negotiating intersections. The horn serves as a communication tool on the road, helping to prevent accidents by making your vehicle's presence known to others.

In contrast, signaling a friend or expressing frustration are not appropriate uses of the horn and can lead to misunderstandings or road rage. Similarly, while warning pedestrians is important, the use of a horn in this context may not always be necessary and could potentially startle them. The primary legal use of the horn remains to enhance safety by ensuring visibility and awareness among drivers.