When is the use of audible warning signals permitted?
Lighting
Explanation
**Acoustic signals** are sounds used to communicate the presence of a vehicle to other drivers. These signals can only be used in specific situations:
- **Avoiding a possible accident**: If there is a risk of collision, the horn can be used to alert other drivers.
- **Overtaking outside built-up areas**: On roads outside a town or city, the horn is allowed to be used to warn a driver that they are about to be overtaken. This ensures that the driver being overtaken is aware of the maneuver and can take precautions.
- **Priority services**: When performing a priority service, such as transporting a seriously injured person to the hospital, the horn can be used to warn other vehicles of the need to pass or park.
Therefore, the correct answer is that the use of acoustic signals is allowed **when I want to overtake outside built-up areas**.
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