When is it acceptable to use your horn while driving?

Using your horn as a warning to other drivers is an important safety practice. The primary purpose of a vehicle's horn is to alert other road users to potential dangers or to gain their attention in situations where a collision might occur. For instance, if a driver is changing lanes without checking their blind spot or if a pedestrian is about to step into the street, a horn can serve as an effective way to prevent accidents.

The other scenarios listed do not align with the intended use of a horn. Greeting friends, for example, can lead to confusion and may distract other drivers. Expressing frustration can create unnecessary tension on the road and escalate road rage situations, while using the horn only in emergencies might limit its effectiveness in warning others of more routine but still hazardous situations. Therefore, using the horn to signal warnings is the most appropriate and responsible usage while driving.