Which turnabout maneuver requires backing across two lanes of traffic?

The option that requires backing across two lanes of traffic is the maneuver of backing into a driveway on the right side. When performing this maneuver, the driver typically approaches the driveway from the street, stops, and then backs into the driveway while potentially crossing two lanes of opposing traffic. This situation commonly arises when there's no safe gap to pull directly into the driveway, thereby necessitating the backing action.

In contrast, pulling into a driveway directly from the street generally doesn’t require crossing multiple lanes of traffic and avoids the complications associated with backing a vehicle. The act of pulling directly into a driveway, either on the right or left side, involves entering the space while facing forward, which allows for more visibility and control without needing to navigate backwards across lanes.

The mid-block U-turn maneuver also does not directly involve backing across multiple lanes, as it is executed by turning the vehicle around in a single motion at a midpoint between intersections.