426MLLHR Grade Separation

Engaged by Rio Tinto Iron Ore, with Main Roads WA as the end user, our team led the detailed design of a critical infrastructure upgrade to eliminate a high-risk rail crossing on the Great Northern Highway. The solution included a 42.5m skewed Teeroff bridge over live rail, 8km of highway realignment, major intersections and supporting infrastructure.

This project reflects our ability to deliver complex, multi-disciplinary infrastructure that meets client goals, regulatory standards, and operational needs while driving value at every stage.

What sets this project apart is how our team:

• Adapted to inherited design challenges, reworking a non-conforming reference design to meet funding and stakeholder requirements.
• Optimised capital expenditure, developing dual foundation options and a robust execution strategy that balanced cost, risk, and constructability.
• Challenged conventional standards, working with Main Roads WA to reduce earthworks, minimise environmental impact, and deliver a safer, more efficient design.
• Managed scope and schedule pressures, streamlining intersection geometry and design boundaries to avoid unnecessary cost and disruption.