Final answer:
False. The horn is not only used to communicate presence but also for warning, signaling, and emergency situations.
Step-by-step explanation:
False. While one of the purposes of a car horn is to communicate presence, it is not the only purpose. The horn is also used for warning other drivers of danger, signaling to other drivers in certain situations, and gaining attention in emergencies.
For example, if a driver sees a pedestrian walking on the road, they may use the horn to communicate their presence to the pedestrian and prevent an accident. In this case, the horn serves as a means of communicating presence.
However, if a driver encounters a vehicle suddenly crossing their lane, they would use the horn to alert the other driver and prevent a collision. Here, the horn is being used as a warning signal.