When is it proper to use a car horn?

Using a car horn is primarily intended for safety purposes, and the most appropriate use is to prevent a collision from happening. By sounding the horn, a driver can alert other road users—like pedestrians, cyclists, or other vehicles—to their presence, especially in situations where visibility is limited or where another party might not be aware of an impending danger. This action can effectively prevent accidents and enhance safety on the road.

In contrast, using the horn for greetings, to scare pedestrians, or to signal a friend does not align with its primary safety function and could lead to miscommunication or increased tension on the road. Many jurisdictions also have specific laws regarding horn usage to ensure it is only used in situations that necessitate driver awareness and caution, emphasizing the importance of using the horn responsibly.