When an aircraft is on different airways or routes whose widths or protected airspace do not overlap.
When an aircraft is below 18,000, proceed to and report over or hold at different geographical locations determined visually or by reference to NAVAID
When an aircraft is to hold over different fixes whose holding pattern airspace areas do not overlap each other or other airspace to be protected
When departing aircraft fly specified headings which diverge by at least 45 degrees.
All of the above