When is it appropriate to use your vehicle's horn?

Using your vehicle's horn is primarily intended for safety and communication to prevent accidents or enhance awareness on the road. The appropriate moment to use the horn is to alert other drivers of your presence, especially in situations where there might be a potential collision or if another driver seems unaware of your vehicle's proximity. For instance, if a driver is about to merge into your lane without seeing you, a quick beep can draw their attention and potentially avert an accident.

The other options represent misuse of the horn. Expressing frustration or signaling for a traffic light change does not align with the intended use of a vehicle's horn and could contribute to road rage or distraction. In the case of road rage, using the horn could escalate tensions rather than promote safety and awareness. The horn is a tool for caution and alertness, not for expressing emotions or frustrations on the road.