If I am on a vector I assume it is because there is a conflict at my level, not many thousands of feet below during my ED. Clearly this is a case of turn AND descent, so the chances of hitting someone at my level are pretty slim. In any case I don't imagine many people would turn if they are off the airway on a heading.
If I am on an airway on the other hand I would turn as it is not at all uncommon to see aircraft exactly below me.
Last edited by calypso; 19th Sep 2013 at 05:50.