You should honk your horn when you:

Are approaching an intersection.
Are backing out of your driveway.
Are being tailgated.
See a vehicle approaching in your lane from the opposite direction.
Explanation

You should avoid using your horn excessively, as it can lead to road rage or distract other drivers. However, it is appropriate to sound your horn to warn others of a hazard and help prevent collisions. If a vehicle is heading toward you in your lane, honk your horn and flash your high beams to alert the driver and make them change lanes.

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