Correct answer
When an emergency forces it to travel below 60 km/h.
When an emergency forces it to travel at an abnormally reduced speed, below 60 km/h. That triggers the duty to leave at the first exit. Travelling at 70 or 80 km/h without an emergency does not by itself trigger this rule. Congestion forcing traffic to move slowly does not amount to that vehicle emergency either. If unable to reach the minimum speed and there is a risk of a rear-end collision, use hazard lights while moving; if continuing is unsafe, do not force the vehicle onward.
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Whenever it travels at 80 km/h, even without an emergency.
Whenever it travels at 70 km/h, even without an emergency.
When an emergency forces it to travel below 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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