There are slight differences between URA's subzones within planning area and HDB's neighbourhoods within towns. I;ve included elaboration in the description of the relevant relations

The previous edits were correct, please refer to the following UN documents
https://treaties.un.org/Pages/showDetails.aspx?objid=08000002804cce54

https://treaties.un.org/doc/Treaties/2017/09/20170925%2004-42%20PM/I-54672-Map-AnnexB-English.pdf

Forgot i made edits around Bishan as well in this changeset

is it open yet? i rmb seeing a notice that the junction will fully open by end Oct