They do. Lets asy "A" is an IFR arrival on 4NM final and "B" is VFR in downwind position. They give to B info about traffic. If B confirm they have the traffic in sight (A has to be informed too?) and they can follow A, I got it -its the reduced sep near by the AD", but what if the B says they dont have A insight...in radar enviroment, would you still require at least those 3NM? That would prob lead to loss of sep or at least GoAround for A?! Thanks!!!