Correct answer
When travelling below that minimum without a justified reason.
When travelling below the applicable regulatory minimum. Being slower than other drivers alone does not breach it. Article 49 sets 60 km/h for motor vehicles on motorways and dual carriageways and, on other roads, half the general maximum for the vehicle category. Travel below it is allowed in justified cases, such as traffic, vehicle or road conditions preventing a higher speed without risk, special vehicles, special transport or protection and escort duties. Never increase to an unsafe speed merely to reach the minimum.
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Whenever travelling slower than other vehicles, even above the minimum.
Whenever slowing down in a traffic jam, even when necessary to prevent a collision.
When travelling below that minimum without a justified reason.
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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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