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Question:

When passing a large vehicle, do not pull back in front of the vehicle until you can see

A the front of it in your rear-view mirror.
Explaination

When passing a vehicle, do not merge back in front of the vehicle until you can see the entire front of the vehicle in your rear-view mirror. Large vehicles have long stopping distances. If you merge back directly in front of a large vehicle and then suddenly slow down or stop for some reason, you might get rear-ended by the large vehicle.