There are currently several sections of highway designated for upgrade between Katoomba and Lithgow. The upgrade has been divided into three sections, with individual environmental impact assessments for each section:
The upgrade from Katoomba to Blackheath is proceeding as scheduled although the Blackheath to Little Hartley tunnel has been put on hold.
On Sunday, 15th May 2022, Deputy Premier and Minister for Regional NSW, Paul Toole released the concept plan and the Review of Environmental Factors (REF) for the upgrade between Katoomba and Blackheath. Neither the plan nor REF contain detailed analysis of the environmental consequences and ramifications for the National Park that the upgrade, and broader project, will likely have.
The upgrade is likely to have a significant impact on the environment, including:
Previous information and a 2020 Society statement in relation to the GWH upgrade below: Great Western Highway Duplication - Blackheath
The Transport for NSW website's Have Your Say Facility has closed.
As reported in the Gazette plans to duplicate the highway between Katoomba and Lithgow have been revealed and involve tunnels, bridges and no encroachment on the National Park.
Here's a statement from the Society.
For more information, go to the Blackheath HWY Action Group website.