Correct answer
Whenever they cannot keep to the right-hand edge of the carriageway and, nevertheless, the overtaking manoeuvre can be carried out safely.
Drivers of heavy vehicles, when they notice that another vehicle travelling behind them intends to overtake and they cannot keep to the right, must indicate that they can be overtaken, provided the overtaking manoeuvre can be carried out safely.
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Whenever they are driving on motorways or dual carriageways.
Whenever they cannot keep to the right-hand edge of the carriageway and, nevertheless, the overtaking manoeuvre can be carried out safely.
Whenever they are driving on roads outside built-up areas.
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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.
Overtaking
Manoeuvre of passing another vehicle going the same direction, temporarily using the opposing lane or a free lane.
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