Lighting and Optical Signals
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?
Reviewed on 7 Oct 2026
- A The main beam
- ✓ The hazard warning lights
- C The reversing light
- D The number plate light
Why this is the correct answer
Under Article 130.4 of the General Traffic Regulations, if the vehicle is immobilised by a breakdown or accident, you must switch on the hazard warning lights (and the side and marker lights where appropriate) and use the hazard warning device. Since 1 January 2026 that device is the connected V-16 light; warning triangles are no longer valid (RD 159/2021, first transitional provision).
More questions on Lighting and Optical Signals
- Summarising the lighting rules, the three key ideas to remember are:
- What are the three main functions of a vehicle's lighting system?
- When lighting is mandatory and the vehicle is moving, which lights must be switched on as a minimum?
- During which period of the day is the use of lighting mandatory?
- When is lighting considered insufficient for driving?
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