You may honk your horn when you:

Are approaching an intersection.
Have an oncoming vehicle approaching in your lane.
Are passing a bicyclist.
All of the above.
Explanation

Avoid using your horn on the road except in emergencies, as it can provoke road rage or startle cyclists and pedestrians. However, if a vehicle is approaching in your lane, warn them of their mistake by sounding your horn or flashing your lights, if time permits.

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This question appears in the following DMV practice tests: