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Infrastructure Investment Program

The Australian Government is committed to a 10-year, over $120 billion infrastructure investment pipeline, ensuring a rolling program of sustainable land transport infrastructure projects.

The Government is working in partnership with states and territories to deliver a credible and sustainable pipeline of projects which support a range of economic and social objectives, including productivity and resilience, sustainability and liveability.

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We acknowledge the traditional owners of the Country throughout Australia and their continuing connection to land, sea and community. We pay our respect to them and their cultures and to the Elders past and present.

©2026 Commonwealth of Australia

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Submissions or registrations of interest to be kept informed about the progress of this work, can be made directly via email to costestimation@infrastructure.gov.au or by using the form below.

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Australian Privacy Principle 5 Notice

Your submission, including any personal information supplied, is being collected by the department for the purpose of seeking public and industry comment on the approach and content of its proposed cost estimation guidance, in accordance with the Privacy Act 1988 (the Privacy Act).

Your personal information will be stored securely by the department. It may be used by the department to make further contact with you about the consultation process. Your personal information will not be disclosed to any other third parties, except in the circumstances outlined below.

Submissions, in part or full, including the name of the author may be published on the department's website or in the Government's response, unless the submission is confidential. Confidential submissions (including author name) will not be published. Private addresses and contact details will not be published or disclosed to any third parties unless required by law.

Submissions will only be treated as confidential if they are expressly stated to be confidential. Automatically generated confidentiality statements or disclaimers appended to an email do not suffice for this purpose. If you wish you make a confidential submission, you should indicate this by ensuring your submission is marked confidential.

Confidential submissions will be kept securely and will only be disclosed in the following circumstances:

  • in response to a request by a Commonwealth Minister;
  • where required by a House or a Committee of the Parliament of the Commonwealth of Australia; or where required by law.

The department may also disclose confidential submissions within the Commonwealth of Australia, including with other Commonwealth agencies, where necessary in the public interest.

Please note that in order to protect the personal privacy of individuals in accordance with the Privacy Act any submissions containing sensitive information, personal information or information which may reasonably be used to identify a person or group of people may not be published, even if not marked as confidential.

The department's privacy policy contains information regarding complaint handling processes and how to access and/or seek correction of personal information held by the department. The Privacy Officer can be contacted on (02) 6274 6495.

Western Sydney Roads - Planning 
The project will develop Final Business Cases for three projects in Western Sydney:- Great Western Highway/Parker Street,- The Northern Road, Borrowdale to Londonderry; and- Werrington Arterial Stage 2 – St Marys to Marsden Park. These upgrades would support the Western Parkland City and address a series of upgrades required in the region to support housing development and flood evacuation routes.
Coxs River Road Upgrade
This project will realign and widen the Great Western Highway for approximately 2.4 kilometres and include a grade-separated interchange at Coxs River Road.
Eva Valley Access Road - 053167-14NT-RTR
The road is of gravel structure with corrugation, pot holes and wash outs from constant traffic over the dry season.Maintenance grade to repair road to a suitable and safer gravel road for traffic.
Nelson Bay Road - Williamtown to Bobs Farm
This project will realign the two-lane, two-way Nelson Bay Road with upgrades to intersections at the eastern (Bobs Farm) and western (Williamtown) ends as well as an upgrade to the Lemon tree Passage connection. The design will enable the duplication of the alignment in the future should funding become available.
South West Rocks Road - 053169-14NSW-RTR
Current road pavement is in a highly variable condition with subgrade and pavement failures creating safety issues.Works proposed include deep pavement reconstruction, stabilising of existing pavement, widening where appropriate and reseal or asphalt overlay to create a more uniform travel surfaceTotal cost of proposed project is $520,000
Dixons Long Point Crossing – Planning
The project will undertake planning for a bridge over the Macquarie River at Dixons Long Point, including road approaches.
Mount Ousley Interchange
This project involves the construction of a new interchange between the M1 Princes Motorway and Mount Ousley Road. The interchange will replace the existing intersection, which is a significant pinch point of the Motorway network, and currently experiences long queues and delays during peak periods. As the primary access point to Wollongong and Port Kembla, issues at this intersection also create significant flow-on effects across the wider transport network. This project will improve travel times, as well as access to the Wollongong central business district and the University of Wollongong. It will ensure safer access to and from the Motorway to Mount Ousley Road, and improve safety by separating cars and heavy vehicles travelling down Mount Ousley.
Nowra Bridge
The project involves the construction of a new northbound bridge, repurposing of the existing northbound bridge to take southbound traffic, and rehabilitating and repurposing the historic truss bridge for active travel use.
Hume Highway Corridor Assessment and Strategy - Planning
The project will deliver a corridor assessment and management strategy for the full length of the Hume Highway from Marulan to the Victoria Border.
Mount Ousley Safety and Reliability (MOSAR) - Planning
The project will undertake development activities and the preparation of a Final Business Case to improve the safety and resilience of the M1 Princes Motorway at Mount Ousley.

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