Which of the following is a poor reason to sound your horn?
It is a good idea to sound your horn before riding past a vehicle or pedestrian that may move into your lane. If you see a driver in an adjacent lane driving too closely to the vehicle ahead of them, you may assume that they want to pass and may cut in front of you to do so. If you see a person in the driver's seat of a parked car, or if you see a pedestrian or bicyclist in the street, it is a good idea to sound your horn as you pass.
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