The $523m Mordialloc Freeway Project comprises a 9 km freeway link between Dingley Bypass and the Mornington Peninsula Freeway at Springvale Road.

The alignment included the following:

  • Several grade-separated interchanges
  • Five bridges over existing roads
  • A twin bridge over sensitive wetlands
  • A pedestrian underpass structure
  • A parallel cycling/walking path along its length

Tonkin + Taylor took on the role of lead designer, providing geotechnical, landfill and environmental consultancy services for the project. Our focus encompassed several critical areas of development.

Firstly, we developed robust, innovative, and cost-effective ground improvement solutions. These measures were implemented to enhance the settlement and stability performances of bridge approaches, retaining walls and large road embankment in challenging ground conditions.

Furthermore, we provided differing foundation solutions that were both robust and innovative. These solutions supported the construction of six bridges, noise walls, signs, and barriers, considering the complex and varying ground conditions present at the site.  Additionally, we have also provided underground utilities impact assessments and protection scheme.

Our expertise extended to designing a passive landfill gas system to effectively mitigate the impacts of landfill gas migration while ensuring compliance with the project and Environmental Protection Agency (EPA) requirements.

Lastly, we offered invaluable geotechnical and pavement engineering support during the construction phase. This support contributed to the development of a reliable infrastructure.

The Mordialloc Freeway opened to the public on 21 Nov 2021 – ahead of schedule.

Project Awards

  • Winner: Civil Contractors Federation Earth Award for projects over $150M
  • Winner: Contractor Excellence Award by Infrastructure Partnerships Australia (IPA)
  • Winner: Excellence in Environmental Outcomes Award, Infrastructure Sustainability Council (ISC)
  • Finalist: Australian Construction Achievement Award 2022
  • Finalist: Consult Australia Excellence Award 2022 – Innovative Design (Geotechnical)


  • Geotechnical Investigation
  • Pavement engineering
  • Bridge foundation design
  • Soft soil and ground improvement
  • Settlement and monitoring
  • Landfill gas venting system design and monitoring
  • Utilities impact assessment and protection scheme



  • 2018 – 2021

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