Which of the following is part of a driver's communication system?

The horn is an essential part of a driver's communication system because it allows drivers to signal their presence and intentions to other road users. Using the horn can alert pedestrians, cyclists, and other vehicles to your approach, especially in situations where visibility is limited or when you need to warn someone of an imminent danger. Effective communication on the road is crucial for safety, and the horn serves as a quick and alerting means to convey messages in a variety of driving situations.

In contrast, while headlights, brakes, and wipers are important for vehicle operation and safety, they primarily serve different functions. Headlights illuminate the road for visibility, brakes provide the necessary stopping power, and wipers help maintain clear visibility during rain or adverse conditions. However, these functions do not primarily serve the purpose of communicating with other drivers or road users, which is why the horn is the most fitting answer for a communication tool within a driver’s system.