Correct answer
45 km/h.
It is 45 km/h, half the general 90 km/h limit. A lower speed is permitted when traffic, vehicle or road conditions prevent maintaining it safely. This differs from the 60 km/h minimum on motorways and dual-carriageway motorways.
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50 km/h.
60 km/h.
45 km/h.
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Glossary terms in this question
Conventional road
Interurban road that is not a motorway, dual carriageway or expressway.
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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