Zulu Holds
The orginal Zulu holds on the southside of 05L-23R, were Visual Holds, used only in easterly dual runway operations when 05L was the departure runway (75m from runway centreline?). They were always a bit too close to the runway in my opinion. The renaming of the old Z2's to Z1's was to standardise the concept that the closest stopbar to the runway will be a number 1, as per the northside of 05L-23R. The new Z1's are CATI/II/III holds.
Looks like they buggered up the plates though!