After passing a car, it is safe to return to your lane when:

The driver you passed slows down to let you return to your lane.
You are at least 100 feet ahead of the car you passed.
You are at least 50 feet ahead of the car you passed.
You can see both headlights of the car you just passed in your rearview mirror.
Explanation

As a driver, it is important to return to your original driving lane after passing another vehicle in a safe manner. When you can see the entire front or both headlights of the car you just passed in your rearview mirror, you have enough distance between your vehicle and the one you just passed to safely return to your lane.

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