Why don't we simply use three classes of airspace:-
Class A - Only IFR traffic permitted (At the moment SVFR is permitted but this will disappear next year)
Class C - IFR vs IFR, traffic separated. IFR vs VFR, traffic separated. VFR vs VFR, traffic information provided.
Class G - Your on your own.
Last edited by Another_CFI; 20th Jul 2013 at 21:50.