Sydney Motorway Corporation works closely with environmental regulatory authorities including the Environment Protection Authority (EPA), the Commonwealth Department of the Environment and Energy (CDEE), and the Department of Planning and Environment (DP&E) to ensure compliance with their legislation and guidelines.

Planning approvals and project delivery

Each project is subject to a thorough environmental impact assessment under the Environmental Planning and Assessment Act, 1979.

This process involves preparing and exhibiting an Environmental Impact Statement (EIS) for each project. The EIS includes information on the project design; air quality; heritage; traffic and transport impacts; and the management of other construction and operational impacts.

We invite stakeholders and community members to provide feedback during the preparation and public exhibition of the EIS. The NSW Minister for Planning considers all community feedback in the planning approval process for planning approval.

We work closely with our contractors to ensure our projects are delivered in accordance with:

  • the measures identified in the related Environmental Impact Statement and Submissions and Preferred Infrastructure Report
  • the Conditions of Approvals set out by DP&E and the NSW Minister for Planning
  • the related project Environmental Protection Licences.



Sydney Motorway Corporation focuses on resource efficiency through considered avoidance, use, reuse, recycling, and waste management.

We explore ways to minimise energy use and choose materials with a lower environmental impact.

Through a combination of well-designed infrastructure, and the transfer of vehicles from surface roads to tunnels, Sydney Motorway Corporation is on track to reduce greenhouse gas emissions by over 610,000 tonnes each year once WestConnex is complete in 2023.

Our principal contractors prepare and implement an Energy Efficiency and Greenhouse Gas Emissions Strategy, detailing processes to reduce energy usage during construction and operation. This includes integrating energy efficient elements into the design of the New M4, New M5 and M4-M5 Link, such as:

  • LED lighting to reduce electricity usage
  • low pressure fans requiring less energy for tunnel ventilation
  • mainline tunnels designed for long term performance.


Our efficiency goals and metrics are outlined in our Sustainability Strategy.