Correct answer
60 km/h.
60 km/h. Article 49.1 sets that minimum for motor vehicles on motorways and dual carriageways, even if no other vehicles are present; it is not half the posted limit. Lower speeds are permitted when traffic, vehicle or road conditions prevent maintaining a higher speed safely. Never accelerate to meet a minimum if doing so creates danger.
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50 km/h, because it is half the posted limit.
60 km/h.
100 km/h, because minimum and maximum always coincide.
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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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