Correct answer
When immobilised on a motorway.
When immobilised on a motorway or Spanish dual carriageway, or in places or circumstances substantially reducing visibility, if fitted; use position lights as applicable too. Article 49.3 requires hazards when the vehicle cannot reach the required minimum speed and there is a rear-end collision risk. Not every normal speed reduction requires them, and switching them on does not permit double parking. Exceptional casualty transport under article 70 has specific conditions and does not establish this requirement for every patient journey.
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Every time it slightly reduces speed under normal conditions.
When immobilised on a motorway.
To make double parking permissible.
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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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