When should you return to your lane after passing another vehicle?

Answer: C — When you can see both headlights of the vehicle you just passed in your rearview mirror

Returning to your lane after passing another vehicle should be done only when you can see both headlights of the vehicle you just passed in your rearview mirror. This is crucial because it indicates that you have created enough space between your vehicle and the one you just overtook, ensuring that it is safe to re-enter your lane without risking a collision. It is important to have a clear visual confirmation that the other vehicle is at a safe distance behind you, as relying solely on intuition or timing may not accurately reflect the actual distance or speed of the other vehicle. By focusing on the headlights in the rearview mirror, you are using a standardized method of determining when it is appropriate to merge back into your lane, which helps maintain safe driving practices.