As a part of the $4.4 billion Western Sydney Infrastructure Plan (WSIP), the Australian and NSW governments are building the 16 kilometre M12 Motorway (M12).

The $2.1 billion east-to-west M12 is designed to connect the Western Sydney International Airport with Sydney’s wider motorway network, increasing capacity, easing congestion, and reducing travel time.

In collaboration with GHD, BG&E helped to deliver the Central Package, which encompassed a 7.5 kilometre section between Badgerys Creek and Duff Road, Cecil Hills. The project features seven new bridges, new dual carriageway motorway, active transport links, and complex flooding, drainage and water quality considerations.

BG&E were instrumental in the following aspects of the project

• Structures design lead for the complex voided slab bridge at Elizabeth Drive and the Super-T bridge for the university access.
• Internal reviewer for four other Super-T and plank bridges – two of them are classified as Class C – complex bridges.
• Value engineered to improve bridge constructability and aesthetics.
• Lead flood modeller, responsible for significantly reducing the spans of the bridge crossing across Kemps Creek and South Creek.
• Lead pavement drainage engineer, responsible for the design and modelling of the pavement drainage network and the water quality treatment strategy.

The project is targeting an ‘ Excellent’ Infrastructure Sustainability Rating with the Infrastructure Sustainability Council – by reusing and recycling 95% of the excavated materials, using 40% of recycled aggregates for the sub-base layers, and minimising water use on the site.

The M12 is slated for completion by 2025.