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("White over red" isn't actually possible unless the VASI installation is badly off, the white and red filtered glasses on the lights were fitted upside down by accident, or else if the pilot is accidentally flying upside-down on final.)<ref>{{Cite web |url=http://aviation.stackexchange.com/questions/33151/what-does-a-white-over-red-vasi-indicate |title=What does a white over red VASI indicate? |website=Aviation StackExchange |access-date=2016-11-14}}</ref>{{Self-published inline|date=May 2022|certain=y}}
Simple VASIs are obsolete, having been deleted from ICAO Annex 14 in 1995, however T-VASIS and AT-VASIS are still specified. T-VASIS is defined as twenty light units symmetrically disposed about the runway centre line in the form of two wing bars of four light units each, with bisecting longitudinal lines of six lights". AT-VASIS is defined as "ten light units
arranged on one side of the runway in the form of a single wing bar of four light units with a bisecting longitudinal line of six lights."<ref name="Annex14">{{cite web |title=Annex 14 to the Convention on International Civil Aviation. Aerodromes. Volume 1, Aerodrome Design and Operations |url=https://skylibrarys.files.wordpress.com/2016/07/annex-14-aerodromes.pdf |publisher=ICAO |access-date=1 March 2023 |quote=deletion of specifications on VASIS (AVASIS) and 3-BAR VASIS (3-BAR AVASIS)}}</ref>
==Pulsating VASI==
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