When should you use your motorcycle horn?

Using your motorcycle horn is primarily intended for safety and communication, particularly in situations where it is crucial to get someone's attention to prevent accidents. The correct option emphasizes that the horn should be used whenever you need to alert other road users, whether they are other motorcyclists, motorists, or pedestrians.

In the context of motorcycle riding, using the horn to gain attention can help alert others to your presence, especially in potentially hazardous situations, like when a driver is about to change lanes without seeing you. This usage is crucial in maintaining safety on the road and preventing collisions.

Other suggested uses for the horn, such as greeting friends or signaling a turn, are not appropriate. The horn is not meant for casual communication or signaling maneuvers; instead, turn signals and hand signals are more suitable for indicating direction or intention while riding. Using the horn to warn pedestrians can also be appropriate, but it is crucial to ensure it is done in a way that is necessary and contextually appropriate—not simply as a greeting or for non-emergency situations. Thus, focusing on safety and alertness is what makes this answer the most suitable.