A traffic light changes from red to green. Is it permitted to use the horn to warn another driver that they can now proceed?

Acoustic signals or warnings may only be used by drivers of non-priority vehicles: - To avoid a possible accident, and especially on narrow roads with many bends. - To warn, outside built-up areas, the driver of another vehicle of the intention to overtake them. - To alert other drivers and road users of their presence when the driver of a non-priority vehicle is forced, without being able to resort to any other means, to carry out a service normally reserved for priority vehicles.