When overtaking a vehicle on a two lane highway the safest thing to do before cutting back in front of the vehcile being passed is?

Before cutting back in front of the vehicle being passed on a two-lane highway, the safest thing to do is to ensure that you can see the entire front of the vehicle in your rearview mirror. This indicates that you have enough space to return to your lane safely. Additionally, check for any oncoming traffic and ensure it is clear, maintaining a safe speed throughout the maneuver. Always use your turn signal to indicate your intention to merge back into your lane.