Can acoustic signals be used to avoid a possible accident?
A)Yes, but only on narrow roads with many bends.
B)No.
C)Yes, on any type of road.Correct
Acoustic warnings may only be used exceptionally to avoid a possible accident, especially on narrow roads with many bends, to warn outside built-up areas of the intention to overtake, or to alert other road users of one's presence when carrying out an emergency service.