Lighting and Optical Signals
In which of these situations is the use of the horn (acoustic signal) justified outside built-up areas?
Reviewed on 26 Jul 2026
- A To greet an acquaintance
- ✓ To warn of overtaking and avoid a possible accident
- C To express anger at another's manoeuvre
- D To hurry the vehicle ahead at a traffic light
Why this is the correct answer
Use of the horn is only justified to avoid a possible accident, particularly outside built-up areas to warn of an overtaking manoeuvre. It must not be used unnecessarily or to express annoyance.
More questions on Lighting and Optical Signals
- As a general rule, is the use of acoustic signals (horn) permitted within built-up areas?
- A driver uses a brief flash of the headlights during the day. What is its usual purpose?
- In the event of a breakdown, which of the vehicle's lights can you use to warn other drivers, in addition to the V-16 light?
- Summarising the lighting rules, the three key ideas to remember are:
- What are the three main functions of a vehicle's lighting system?
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