Drivers should use the horn:

To alert other drivers that they made a mistake.
When feeling angry or upset.
Only when necessary, to avoid collisions.
If a driver is moving slowly, and you want them to drive faster.
Explanation

Drivers should use the horn only when necessary, specifically to avoid collisions. Honking is not appropriate for expressing impatience with slow-moving drivers, nor is it to be used to prompt pedestrians, bicyclists, or motorcyclists to move faster. The primary purpose of the horn is safety – to alert others of your presence and prevent potential accidents.

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