When should a motorcyclist use their horn?

Using the horn as a means to alert other roadway users of your presence is essential for safety while riding a motorcycle. Motorcycles are smaller and can be less visible to other drivers, so making your presence known through sound can significantly reduce the risk of accidents. This practice is especially important in situations where a driver's line of sight is obstructed or when you're approaching intersections. Using the horn effectively acts as a warning device that can help prevent collisions by notifying others that you are there.

The other options divert from the primary function of a horn, which is to enhance safety. Signaling turns to other riders relies more on visual cues, such as hand signals or turn signals, rather than the horn. While it's important to avoid showing frustration with other drivers, this can lead to aggressive behavior rather than fostering awareness and safety. Lastly, the horn can be used to alert pedestrians, but its primary function is to ensure that all roadway users are aware of your motorcycle, not just pedestrians. Therefore, option B emphasizes a crucial aspect of motorcycling safety.