It is generally not allowed to sound a vehicle's horn in the following situations:
- In built-up areas between 11:30 PM (or 11:00 PM in some regulations) and 7:00 AM (or 7:30 AM), except when there is an imminent danger to other road users. This is to prevent noise disturbance during night hours.
- When the vehicle is stationary, such as in traffic jams or at traffic lights, unless there is a danger that requires warning others.
- To express frustration, annoyance, or to get the attention of others for non-emergency reasons like greeting someone or urging other drivers to hurry.
- Repeated or aggressive use of the horn is banned as it is considered misuse.
The horn's intended use is only to warn other road users of potential danger or your presence, especially when your vehicle is moving and visibility is low or conditions are hazardous. Using the horn outside these guidelines may lead to fines up to £1,000 in the UK, depending on the severity and recurrence of misuse.
