You should return to your lane after passing another vehicle when you can:

The correct response emphasizes the importance of safe driving practices, particularly regarding lane changes after passing another vehicle. You should return to your lane after passing when you can see the headlights of the vehicle you just passed in your rearview mirror. This visual confirmation indicates that you have sufficient distance from the other vehicle, ensuring that it is safe to merge back into your lane without endangering either yourself or the driver you just overtook.

Relying on other senses, such as feeling the wind from the vehicle or hearing its engine, is less reliable and does not provide a clear indication of distance or safety. Moreover, counting to five seconds could lead to misunderstandings regarding the exact spacing needed, as it does not take into account the speed of the vehicles involved. Visual confirmation through your rearview mirror is a standard and effective practice designed to enhance safety on the road.