After passing another vehicle, when is it safe to return to the original lane?

Returning to the original lane after passing another vehicle should be done only when it is safe, ensuring you have adequately cleared the overtaken vehicle. The correct approach is to wait until you can see the overtaken vehicle in your rear-view mirror, as this indicates that you have created enough space between your vehicle and the one you passed. This view confirms that you are no longer in a position where the other vehicle might impede your lane change, enhancing safety for both drivers.

Other options, such as making the decision based on horn sounds, visual cues from your side-view mirror, or simply when the road appears clear, may not provide adequate assurance of safe distance. Relying on the rear-view mirror is crucial because it conclusively shows that the vehicle you’ve just passed is behind you and that you can safely transition back into your lane without endangering yourself or others.