When is it appropriate to use your car horn?

Using your car horn to alert another driver to your presence when necessary is an appropriate and important use of the horn. It serves as a means of communication to prevent potential accidents or collisions, especially in situations where visibility is limited or when another driver may be unaware of your vehicle's location. For instance, if a driver is about to change lanes and does not see you, a brief honk can help them become aware of your presence and allow you to avoid a dangerous situation.

The other options do not reflect proper horn usage. Honking out of frustration can escalate tensions and may not be constructive in a driving situation. Suggesting that the horn should never be used ignores its utility as a safety tool. Limiting horn use only to residential areas overlooks its role in all driving environments, where alerting others can be crucial for safety.