When is it permitted to use acoustic signals?
A)Only when driving on urban roads.
B)When driving on any road.
C)When I want to overtake outside a built-up area.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.