Règles de la route

Before changing lanes on an Ontario road, you must:

Panneau routier de Ontario — Signal, check mirrors, and do a shoulder check of the blind spot
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Bonne réponse : B. Signal, check mirrors, and do a shoulder check of the blind spot

Safe lane changes in Ontario require all three steps: signal, mirror check, shoulder check for the blind spot. Skipping any step is a leading cause of sideswipe collisions. The signal also gives drivers in the target lane time to react.