You don't have to do this manoeuvre in 3 moves. The name of this manoeuvre is officially - Turn in the Road.
If you find that there isn't enough room to get round on the 3rd part, do your observations, reverse back across the road and then finish the manoeuvre safely. You have done what you were asked to do - a turn in the road.
At test standard you will be capable of doing this manoeuvre in 3 moves.