When is it safe to return to your lane after passing another vehicle?

Returning to your lane after passing another vehicle is determined by the visibility of that vehicle in your rear-view mirror. It is safe to merge back into your lane when you can see both headlights of the vehicle you just passed. This indicates that there is enough distance between your vehicle and the one you overtook, ensuring that it is safe to switch back into your lane without risking a collision.

The focus on using your rear-view mirror allows you to gauge the other vehicle's position accurately, ensuring you have fully cleared it before merging back. This practice is critical for maintaining safety on the road and preventing accidents during the lane change process.