You may honk your horn when you:

Are approaching an intersection.
Are passing a bicyclist.
Have an oncoming vehicle approaching in your lane.
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: