How should other road users be warned that a manoeuvre is about to be made?

Correct answer

With sufficient advance notice

Before any manoeuvre, you must warn with sufficient advance notice and in a clear and understandable manner, using indicators or other regulatory signals. The aim is to allow others to anticipate your movement and adjust their driving without surprise. First, observe: mirrors, blind spots, and priority. Signal in good time, maintain a stable trajectory and speed, and execute the manoeuvre. Turn off the signal when finished and avoid confusing gestures or sudden changes. If the situation is not safe, desist, re-integrate, and signal again when there is sufficient margin.