Is the use of acoustic warnings permitted in built-up areas?
A)Yes, if the sound is not strident.
B)No, they are prohibited in built-up areas.
C)Yes, to avoid a possible accident.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.