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It is recommended that domestic legislation should provide that in built-up areas, in order to facilitate the movement of regular public-transport service vehicles, the drivers of other vehicles shall, subject to the provisions of Article 17, paragraph 1, of this Convention, slow down and if necessary stop in order to allow the public-transport vehicles to perform the manoeuvre required for moving off from stops marked as such. The provisions thus laid down by Contracting Parties or subdivisions thereof shall in no way affect the duty incumbent on drivers of public-transport vehicles to take, after having given warning by means of their direction-indicators of their intention to move off, the precautions necessary to avoid any risk of accident.