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State Highway 58 Safety Improvements—Detailed Design

Paving the way for improving road safety and reducing crash rates

  • 9KM

    Road Length

  • 20

    Lives Saved in 10 Years

  • $50M+

    Construction Value

  • Wellington, New Zealand

    Wellington, New Zealand

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 as well as side-road hazards and poor geometry mean SH58 has one of the worst safety records. The number of high-severity crashes left the local community in a crisis point.

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 probabilistic analysis to inform design. By investigating several complex geotechnical and geometric alternatives, we negotiated design departures—reducing costs and the extent of works while meeting key project outcomes, namely improving road user experience and mitigating visual and ecological effects through landscape design.

Our design’s critical safety improvements—enhanced geometry, median and side barriers, and intersection upgrades with new roundabouts—are designed to slow traffic and prevent high-severity crashes.

At a Glance

Offices
Client
  • New Zealand Transport Agency
Meet Our Team

Jamie Povall, Director, Major Projects

As a project leader, I take responsibility for delivering a high-quality product that meets Stantec, the client, and the community’s needs.

Grant Maxwell, Geotechnical Discipline Leader

I want to build geo-resilient communities that can cope with our changing climate.
Grant Maxwell Geotechnical Discipline Leader Read More

Andrew Craig, Practice Leader, Flood Risk Management

I help clients understand the risks and impacts of flooding and develop resilient solutions to manage uncertainty and climate change.
Andrew Craig Practice Leader, Flood Risk Management Read More

April Peckham, Principal Planner

I support clients to obtain statutory approvals, while also helping keep our communities safe and protect our environment.

Eleni Gkeli, Technical Specialist, Rock Engineering/Geotech, Pavements & Structures Leader

I’m proud that my work helps to maintain critical infrastructure of regional and national significance.
Eleni Gkeli Technical Specialist, Rock Engineering/Geotech, Pavements & Structures Leader Read More

Jeremy Walters, Chief Engineer/Technical Specialist, Bridges

My work in transport and water brings a variety of challenges—if variety is the spice of life, it certainly keeps my job interesting!
Jeremy Walters Chief Engineer/Technical Specialist, Bridges Read More

Kirstie Thorpe, Senior Principal Landscape Architect/Urban Design

I weave threads of landscape together and incorporate their values into infrastructure projects.
Kirstie Thorpe Senior Principal Landscape Architect/Urban Design Read More

Andrew McLeod, Senior Transportation Leader, Wellington

I ensure that road safety is front of mind at all stages of a project.
Andrew McLeod Senior Transportation Leader, Wellington Read More

Jamie Povall

Director, Major Projects

Grant Maxwell

Geotechnical Discipline Leader

Andrew Craig

Practice Leader, Flood Risk Management

April Peckham

Principal Planner

Eleni Gkeli

Technical Specialist, Rock Engineering/Geotech, Pavements & Structures Leader

Jeremy Walters

Chief Engineer/Technical Specialist, Bridges

Kirstie Thorpe

Senior Principal Landscape Architect/Urban Design

Andrew McLeod

Senior Transportation Leader, Wellington

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