It certainly seems there is sufficient confusion here, and it is the wording that causes it. Is the intention to prevent anyone turning left until above 1250', and if so, why? There are no terrain reasons - OR is it as tom says, to provide separation? There should be no confusion. To all those who, like me have an idea of what is 'sensible', it is what is required by the chart constructors that matters, not personal 'interpretation'.