clearway and stopway
What a really interesting thread.
Just like to add. Stopway can exceed clearway because while the piece of ground meets the width required for use as stopway, it doesn't meet the increased width required for clearway, f'rinstance a hillock off to the side which is safe to ROLL past but not to FLY past. (Without considering the lateral dimension, it sounds mystifying that you can roll on it but cant fly over it...!)