Department of Infrastructure, Transport, Regional Development, Communications and the Arts

Great Western Highway Upgrade - Katoomba to Lithgow - Construction of East and West Sections

Funding Program:Investment Road and Rail Program
Status:In planning
Transport Mode:Road
Expected Start/Finish:Early 2023 - Late 2026
Estimated Project Cost:$2,540,000,000
Australian Government Contribution:$2,032,000,000
Local Council/Shire:Blue Mountains City Council,City of Lithgow Council
Corridor:Sydney - Dubbo

Project Description

This project involves the upgrade of the Great Western Highway corridor between Katoomba and Blackheath, and between Little Hartley and Lithgow.

This is the first stage of a broader upgrade to this corridor, and will address a critical missing link in terms of access through, and congestion within, the Blue Mountains.

It will separate local and through traffic, improving freight access, network efficiency, safety and community outcomes. It will also facilitate growth in the New South Wales central west.

Australian Government funding towards the construction of the East and West sections will facilitate the New South Wales Government continuing to fund the planning and development of the Central section of the Corridor between Blackheath and Little Hartley.



  • Improved road safety for all road users
  • Improved accessibility and connectivity of road networks
  • Improved connectivity between people with jobs and services, and goods with markets
  • Improved efficiency and network reliability


The Australian Government has committed $2.03 billion to this project with the New South Wales Government committing $508 million, bringing the total project funding to $2.54 billion.


This project is expected to start construction in early 2023 in Medlow Bath and be finished construction by late 2026.


Disclaimer: The material contained in this site is made available on the understanding that the Department is not thereby engaged in rendering professional advice for a particular purpose. Before relying on the material in any important matter, users should carefully evaluate the accuracy, completeness and relevance of the information for their purposes and should obtain appropriate professional advice relevant to their particular circumstances.

Project details last updated: 24/03/2022