- A To greet other drivers
- B To hurry up the vehicle ahead
- ✓ To avoid a possible accident or, outside of built-up areas, to warn of the intention to overtake.
- D At any time within built-up areas
Why this is the correct answer
The horn is legally permitted only to prevent an imminent accident or, outside of built-up areas, to warn another driver of your intention to overtake. Using it for any other reason, such as greeting others or showing frustration, is prohibited.
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