ICAO Doc 4444
6.1 Reduction In Separation Minima In The Vicinity Of Aerodromes
In addition to the circumstances mentioned in Chapter 5, 5.11.1, the separation minima detailed in Chapter 5, 5.4.1 and 5.4.2, may be reduced in the vicinity of aerodromes if:
a) adequate separation can be provided by the aerodrome controller when each aircraft is continuously visible to this controller; or
b) each aircraft is continuously visible to flight crews of the other aircraft concerned and the pilots thereof report that they can maintain their own separation; or
c) in the case of one aircraft following another, the flight crew of the succeeding aircraft reports that the other aircraft is in sight and separation can be maintained.
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