In what circumstance are drivers of heavy vehicles obliged to signal to those following them that they may overtake?

Question

DentroTest · Accepted Answer

The General Traffic Regulations (Article 86) establish that drivers of heavy vehicles, large vehicles or vehicles subject to a specific speed limit who are about to be overtaken must indicate to the driver following that they may overtake when they cannot keep fully to the right edge of the roadway and the overtaking can be carried out safely. The indication is given with the right indicator or by extending the arm horizontally and moving it repeatedly from back to front, with the back of the hand facing backward. The obligation does not depend on the type of road: it is not limited to motorways or dual carriageways with heavy traffic, nor is it continuous because of driving outside built-up areas. It only arises when they cannot keep to the right edge and the overtaking can be done safely.

In what circumstance are drivers of heavy vehicles obliged to signal to those following them that they may overtake?

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