It says "as near as practicable", so that is what it means. So if the point where it becomes visible is as near as is practicable, that must, by definition, meets the reg.
Of course, opinions will differ as to what is practicable. I'd suggest that it has to be the person on the ground who makes that decision and takes the responsibilty for any consequences.
Of course, opinions will differ as to what is practicable. I'd suggest that it has to be the person on the ground who makes that decision and takes the responsibilty for any consequences.
