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Question:

You should never honk your horn at

A a bicyclist whom you are about to pass.
Explaination

Use your horn to warn others of danger to themselves or to you. However, sounding your horn at a bicyclist is dangerous. It may startle the bicyclist and lead to an accident. Likewise, don't sound your horn at a rider on horseback or a horse-drawn vehicle, because it may startle the horse.