Correct answer
60 km/h.
60 km/h. Article 49.1 sets this minimum for motor vehicles on motorways and dual carriageways; it is not calculated as a fraction of a specific maximum-speed limit. Article 49.2 allows lower speeds when traffic, vehicle or road conditions prevent a higher speed without risk, and in its other listed cases. Never accelerate beyond what is safe to maintain a minimum in queues or adverse conditions.
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80 km/h.
One third less than any specific maximum-speed limit.
60 km/h.
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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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