Which turnabout requires that you back into the traffic flow before moving forward?

The situation described requires an understanding of how to safely perform a turnabout maneuver. When you choose to pull into a driveway on the left side, you will have to enter the driveway and then turn around to face the other direction. However, in this specific maneuver, the key factor is that you may end up needing to back into the traffic to safely exit the driveway after completing the turnabout.

By facing the driveway directly when pulling in from the left, you can align your vehicle to exit back onto the road without having to back your vehicle from the road into the driveway first. This minimizes disruption to traffic and allows for a clear exit onto the street. Additionally, entering from the left side ensures that you have a better view of oncoming traffic, which improves safety when completing the turnabout.

The other methods referenced involve either backing directly into a driveway or turning around in a way that requires additional maneuvers that could complicate the process or create hazards. In contrast, the left side method allows for a more streamlined approach to adjusting your vehicle's direction while keeping afresh alignment with the flow of traffic upon exiting.