a device emitting an acoustic signal the operation of which is intended to give warning of the presence of or a manoeuvre by a vehicle in a dangerous road traffic situation
Audible warning devices may be used only: (1) to give due warning with a view to avoiding an accident; (2) outside built-up areas when it is desirable to warn a driver that he is about to be overtaken.
Every motor vehicle shall be equipped with at least one audible warning device of sufficient power. The sound emitted by the warning device shall be continuous and uniform, but not strident. Priority vehicles and public passenger-transport vehicles may have additional audible warning devices which are not subject to these requirements.
