Correct answer
To warn another driver of the intention to overtake them.
To warn another driver of an intention to overtake outside built-up areas. The horn is also allowed to avoid a possible accident and in the regulated case of a non-priority vehicle performing an urgent service. A queue, road hump or narrow road alone does not justify sounding it, nor strident or unjustified use.
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To warn another driver of the intention to overtake them.
When traffic is very heavy or there are tailbacks.
On narrow roads when there is a speed bump in the carriageway.
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