Final answer:
When passing any vehicle, it's safe to return to your driving lane when you can see the passed vehicle's headlights in your rearview mirror. This ensures that enough distance has been maintained between you and the passed vehicle, reducing the risk of a collision.
Step-by-step explanation:
When passing any vehicle, it's safe to return to your driving lane when you can see the passed vehicle's headlights in your rearview mirror. This ensures that enough distance has been maintained between you and the passed vehicle, reducing the risk of a collision. By waiting until you can see the headlights, you have a clear indication that there is enough space between the two vehicles.
For example, if you are passing a car and you can see its headlights in your rearview mirror, it means you have put enough distance between your car and the passed car, allowing you to safely return to your driving lane.