The start of a manoeuvre is when a rider most needs the attention of other drivers. At that moment, drivers are judging mirrors, speed and nearby traffic, so the motorcycle needs to be as easy to notice as possible.
An early turn signal gives a clear cue, but it is not enough on its own. If the motorcycle sits in a blind spot or too close behind another vehicle, the signal may be noticed too late.
SAAQ visibility material stresses that riders should use the full visibility package: lights, contrasting gear, distance and road position. Together, these elements help others understand where the motorcycle is and what it will do next.
A good daily habit is to check mirrors briefly before moving, leave space and signal early enough. The clearer the beginning of the manoeuvre is, the less sudden reaction is needed from surrounding traffic.