The Torrens to Darlington (T2D) Project is the final 10.5km section of the North-South Corridor, and will complete 78km of non-stop, traffic light-free motorway between Gawler and Old Noarlunga. Drivers will be able to bypass 21 sets of traffic lights as they travel through two separate tunnels, connected by an open motorway.

Using a combination of tunnels, lowered and surface-level motorway, as well as underpasses at key intersections, the project will complete the North South Corridor, creating 78km of non-stop motorway between Gawler and Old Noarlunga.

Services Provided

North Projects was engaged under the SWAPP Joint Venture (SMEC, WSP, APP) to provide Independent Construction Verification Services for the Torrens to Darlington (T2D) Project. Our role encompassed comprehensive oversight to ensure quality, compliance, and assurance across all stages of delivery, including:

• Reviewing construction documentation for compliance with master specifications.
• Conducting on-site surveillance to verify construction quality and accurate record-keeping.
• Managing the release of hold and witness points.
• Identifying potential issues early through audits, surveillance, and QA reviews to safeguard project outcomes.
• Providing expert review and advice on Non-Conformance Reports (NCRs) and Requests for Information (RFIs).
• – Assessing safety and environmental compliance against T2D and DIT standards.

With the project in its early stages, current activity is centred on the South Tunnel South Portal—laying the groundwork for the arrival of the first Tunnel Boring Machine (TBM) in late 2025. In collaboration with the SWAPP JV, North Projects has begun implementing robust verification systems and control processes to oversee all aspects of delivery. This includes detailed review of construction documentation and on-site verification of key early works such as temporary structures, CFA piling, and diaphragm wall construction—establishing a strong foundation for quality, compliance, and assurance as the project progresses.