Detailed design, ground investigation, consents, land acquisition and contract documentation
State Highway 58 (SH58) is one of the most dangerous roads in New Zealand (NZ). High speed and traffic volume, poor geometry and side-road hazards mean SH58 has one of the worst safety records.
The situation reached a crisis point and the local community had witnessed too many high severity crashes.
We helped the NZ Transport Agency respond—having won the contract for detailed design and construction monitoring, we accelerated our delivery programme and completed the design, consents, and land acquisition in nine months rather than the normal 18–24.
Our geologists undertook a major drilling programme providing insight into challenging geotechnical conditions, informing route design, and allowing us to balance constructability, value for money and innovation with design requirements, cost, construction methods and road user impacts.
Extending this insight and incorporating stakeholder feedback, we challenged one-size-fits-all standards and used software for probabilistic analysis to inform design. By investigating several complex geotechnical and geometric alternatives we negotiated design departures and reduced the extent of works and costs while meeting key project outcomes.
Our design has critical safety improvements: enhanced geometry, median and side barriers, and intersection upgrades with new roundabouts all designed to slow traffic and prevent crashes that result in serious injury and death.
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