When passing another vehicle, when should a driver return to the right-hand lane?

The correct answer is that a driver should return to the right-hand lane once the entire car being passed is visible in the rearview mirror. This practice is essential for ensuring that the passing maneuver is complete and safe. By confirming that the entire vehicle is no longer in the driver's blind spot and can be fully seen in the rearview mirror, the driver ensures they have enough distance from the passed vehicle before re-entering the right lane.

This approach minimizes the risk of collisions, as returning to the right lane too early could lead to cutting off the passed vehicle, which may still be too close. It also adheres to good driving practices that prioritize visibility and awareness of surrounding traffic, helping to maintain safety on the roadway.

In contrast, returning to the right lane as soon as passing begins or when the vehicle is halfway passed does not allow enough time for a safe maneuver. Those actions could result in a dangerous scenario if the speed of either vehicle changes unexpectedly. Additionally, the idea of returning "as soon as possible for safety" lacks the necessary specificity that the correct answer provides regarding visibility and situational awareness. Establishing the precise point at which it is safe to return to the lane is key to effective driving.