After you have passed a car, you can safely merge back into the right lane when:

You can see the head of the driver in your rear-view mirror.
You can see the front of the vehicle in your rear view mirror.
You are about 15 feet ahead of the car.
You see another vehicle arriving from the opposite direction.
Explanation

After passing a car, glance at your rear-view mirror to ensure you can see the entire front of the vehicle you passed. This indicates there's enough space for you to merge back into your lane safely without cutting off the other driver.

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