Fresh criticism has been raised about the proposed Huntlee residential development near Branxton.
Community groups including the Hunter Environment Lobby and Two Trains for Singleton have expressed outrage over the lack of integrated public transport for the 1 400 home development.
Developer LWP has not committed to further public transport links, including a heavy rail link for the new city despite ongoing public complaints.
This places the pressure of an additional 5 500 people on existing public transport infrastructure.
LWP has not responded to the attacks yet, however signalled in a draft plan earlier this year they will explore further transport connections after the completion of the Hunter Expressway.