Correct answer
When I want to overtake outside a built-up area.
The use of audible warning signals or the horn is permitted in specific, regulated situations to minimise noise pollution and disturbance to others. The circumstances in which it may be used are: Accident prevention: in both urban and rural areas, the horn may be used to avoid a possible accident or collision with a pedestrian. Emergency services: in an emergency, when carrying out an emergency service. Narrow roads with bends: on narrow roads with many bends, especially where visibility is limited. Overtaking outside built-up areas: only outside built-up areas, the horn may be used to warn of the intention to overtake another vehicle.
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When travelling on any road in any circumstances.
When travelling on urban roads only.
When I want to overtake outside a built-up area.
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