When is it appropriate to use your horn while driving?

Using your horn while driving is primarily designed as a safety tool to signal a warning to other road users. This can be especially important in situations where your vehicle is at risk of colliding with another vehicle, pedestrian, or cyclist. For instance, if another driver is veering into your lane or if a pedestrian is about to cross in front of your car, using the horn alerts them to your presence and helps prevent accidents.

The other choices do not represent appropriate or effective uses of the horn. Expressing frustration is not a constructive use of the horn and can lead to road rage. Using the horn in a quiet area may disturb others unnecessarily and is generally discouraged unless it is to avoid a potential hazard. Constantly using the horn is also inappropriate as it creates noise pollution and can draw attention away from genuine warnings. Therefore, the focus should always be on using the horn to communicate necessary caution and safety to others on the road.