Hundreds of homes would be impacted by the F6 motorway extension running largely above ground through Sutherland Shire.
A leaked state government document, obtained by 9 News, shows a surface road from Taren Point to Miranda on the long-established reservation, which at present is parkland or leased to businesses such as Flower Power.
The motorway would run in a tunnel under Kingsway before emerging in Gymea as a surface road and continuing through Kirrawee and Royal National Park to Loftus.
It would then run along the eastern side of Princes Highway, just inside the national park.
Tunnels would bypass parts of Heathcote and Waterfall.
Excising sections of the national park for the motorway caused an outcry when the proposal was revealed in documents obtained by Fairfax Media earlier this year.
There has been a corridor reservation in place since the ‘50s, so it’s not a new route.Scott Morrison
The new report, dated August, 2017, will add to uncertainty for many residents.
Tunnel entrances and exits are not clear, and exhaust stack locations are not shown, so residents will remain in the dark until the government releases full details.
Attorney-General and Cronulla MP Mark Speakman, who is leading the push for the extension, said, “No F6 decision has been made”.
Mr Speakman said the position had not changed since June this year, when Fairfax Media published documents.
Mr Speakman said at that time he expected a decision on the preferred configuration in 6-12 months.
“There will be extensive community consultation and environmental impact studies after that, before any final decision and commitment to build anything,” he said.
Acting Opposition Leader Michael Daley said the plans were “being cooked up behind closed doors and always the community is the last to know”.
Cook MP and federal Treasurer Scott Morrison said the F6 extension was “a good thing for southern Sydney, a good thing for southern NSW, and I commend the state government and the premier for moving forward”.
“There has been a corridor reservation in place since the ‘50s, so it’s not a new route – the specifics will be new, I am sure – but obviously they will work through all the details and consult with the community,” he said.