Appointment

AECOM takes the design on Northland Corridor Section One

By Staff Writer  |  01-09-2026

AECOM has been appointed design partner for the Warkworth to Te Hana project in New Zealand, working with ACCIONA as lead contractor. The appointment was announced by the firm on 31 August 2026. The project is Section One of three roads on the Northland Corridor Program, a new 100 kilometre motorway connecting Auckland to Whangarei, and it will upgrade the existing State Highway 1 to a higher standard motorway.

ACCIONA, with its partner Aberdeen Investments, comprises the Northway Consortium. The transport agency for New Zealand is named as the client body on the project alongside the consortium and the design partners.

A designer on a 100 kilometre motorway programme is the appointment that sets the geometry, the earthworks quantities and the resilience standard for everything that follows.

What the design has to solve

The stated design solution addresses safety challenges for current road users through a new system interchange, an optimised alignment that improves curves and sight distances, and safer gradients. The alignment is also described as improving resilience by reducing impacts from flooding, landslides and other extreme weather events.

Those two objectives pull against each other on this kind of terrain, and that is the engineering problem. Improving curve radii and sight distances on an existing highway alignment means taking the road away from the line it currently follows, which usually means deeper cuts and higher fills. Higher fills on ground prone to landslides are exactly what a resilience brief is trying to avoid. Resolving that is a matter of where the alignment sits in relation to the geology rather than a matter of pavement design, and it is settled early or not at all.

The alignment also decides the earthworks balance, and the balance decides the programme. The firm states that its design solution reuses on site materials, reducing the need for imported materials and minimising waste, and that this will lower haulage and embodied carbon while delivering cost efficiencies. A cut to fill balance achieved on paper depends on the winning of material actually behaving as the ground investigation predicted, and unsuitable material is the commonest source of variation on a long linear earthworks job.

What was said

Mark McManamny, chief executive of the firm's Australia and New Zealand business, described the Northland Corridor as an investment that will improve safety, resilience and connectivity across the upper North Island. He said the firm had brought together transportation, engineering and design specialists from across New Zealand, Australia and its global business to support delivery, and that with the expertise of the transport agency, the lead contractor and its design partners this gave an outstanding platform to deliver infrastructure that will improve how people and freight move, support economic growth and bring lasting benefits to Northland communities.

Russell Jackson, interim chief executive of the firm's global transportation business, said the selection reinforced its reputation in transportation engineering services, described the 100 kilometre project as a major investment in New Zealand's transport infrastructure and economic growth, and said the firm looked forward to partnering with the lead contractor.

The announcement states that the project forms Section One of three roads of national importance along the broader Northland Corridor Program, and that the completed motorway will connect Auckland to Whangarei over 100 kilometres. The stated benefits are improved travel times for cars, freight and public transport, eased congestion, and better connection between the growing Northland community and Auckland.

For a contractor tracking the market, the useful fact is the sequencing. Section One being let and designed puts the remaining two sections into a definable pipeline behind it, and the design partner on the first section will carry the corridor standards into whatever follows.

What the announcement does not carry

No contract value is published for the design appointment or for the construction contract, and none is stated here. There is no start date on site, no completion date, no length given for Section One itself as distinct from the 100 kilometre programme, and no breakdown of the design scope between the consortium partners. Those figures are absent from the record rather than withheld from this report.