Originally Posted by
chevvron
In any case, if the ATZ remains class G, then class G VFR rules will apply (140kt or less anyway) rather than class D rules; creates known traffic without as much restriction for transits.
VFR minima in class D are set so that there is a reasonable chance of resolving a conflict between an IFR and a VFR flight visually. For flights in a vis of less than 5 km, SVFR is required and ATC provides separation.
If you're going to permit VFR flights to operate in visibilities down to 1500 m without separating them from IFR flights, you might as well not bother with the regulated airspace at all! The chances of resolving a conflict visually at a closing speed of 250 kt in a vis of 1500 m is virtually nil.