when need to make a U-turn, sometimes it could be on the left side of the road or even on the right.
it would be less chaotic and sudden change of lanes if the driver knows how/where the U-turn will take place, especially if there were were many lanes, then need to be prepared early to be on the U-turn lane.
it could be make the U-turn on the right lane, where there is a specific lane for U-turn.
or even it could be taking the traffic light on or below the flyover.