Originally Posted by
CallmeJB
These glideslope/step-down fix/barometric altimetry violations are almost always about airspace construction and traffic separation, not about terrain.
Perhaps so at major terminals, but terrain is a big factor in some cases. Attached is a good example. They offer a second procedure that uses the GS out beyond the normal maximum distance for an ILS final segment. Regular users of the airport like the Z option a lot more. (EDIT: They FAA is doing away with the "Z" procedure on October 12.)