Driveway turn-around radius
I am trying to pare down and define my overly-huge driveway turn-around. We have a long, long drive edged by a stone-wall and then towards the garage and house, by high retaining walls.
I understand the concept of taking a 17 foot string and creating an arc for the turning radius into the dogs-leg or turn-around (you can see some markings I made in white to this effect)--but I don't know how to determine where the nail or center of the circle or radius line should be located...and this important issue is not covered in my landscaping books. Help most appreciated.