Epping M2 Bus Ramp "Essential Part of the M2"

I have been advised that the proposal to build the original M2 ("Castlereagh Expressway" as it was then) was examined by the Woodward Commission of Inquiry in 1989, hearing 829 submissions from 301 parties including 52 experts. The inquiry found that the M2 SHOULD NOT BE BUILT, ON ALL GROUNDS.
To resurrect the project it was modified to INCLUDE THE EPPING BUS RAMP. This excellent proposal would allow morning commuter buses from north west Sydney to get rapidly to Epping railway station and avoid the M2 car park from there to the city, and bus passengers could then commute comfortably and swiftly by train from Epping. This significant and sensible development resulted in the M2 project being re-considered, and approved as a road based but integrated transport solution.
On that basis the Epping bus ramp is an integral and essential part of the M2, without which the M2 would not have been permitted. How now can the RTA propose to remove it?