Correct answer
Yes, to warn of rear-end collision risk in that situation.
Yes, to warn of rear-end collision risk under Article 49(3). Hazard warning lights are not reserved for stationary vehicles or prohibited merely because the vehicle is in a built-up area. They do not make every journey in a faulty vehicle safe or permitted: follow rules on position, leaving a motorway or dual carriageway when required, and safely removing the danger.
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Yes, to warn of rear-end collision risk in that situation.
No, they are prohibited merely because the vehicle is in a built-up area.
No, they can only be used while stationary.
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Glossary terms in this question
Dual carriageway
Fast road with separated carriageways per direction and at least two lanes each way, no at-grade intersections.
Motorway
Top-grade public road with separated carriageways, no direct property access, restricted to motor vehicles.
Minimum speed
Speed below which you may not drive without obstructing other traffic, except for justified causes.
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