Correct answer
With sufficient notice before starting the manoeuvre.
A driver of a vehicle must always give warning by visual signals of any manoeuvre involving a sideways or backward movement of the vehicle, as well as of their intention to stop it or slow down considerably. These visual warnings must be given with sufficient notice before starting the manoeuvre and, if they are light signals, must remain in operation until the manoeuvre is finished.
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At the very moment of starting a manoeuvre.
When driving their car on emergency service duty.
With sufficient notice before starting the manoeuvre.
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