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Pavement made from deep lift, also known as structural asphalt is made up of multiple layers

Kia ora

Te Aranui o Te Rangihaeata – SH1 Transmission Gully is now open, providing a safe, modern and reliable route in and out of Wellington.

  • Estimated project cost

    $1.25 billion

Transmission Gully motorway route map

About the Transmission Gully Project

Built to demanding specifications, this road will be safer and more reliable for motorists, and better able to resist and recover from earthquakes and storms.

The project is highly complex with difficult and steep terrain requiring large-scale earthworks during construction. Twenty-five new structures equating to a total length of more than a kilometre have been constructed along the route. The largest of these, Te Ara a Toa (Bridge 20) over Cannons Creek, stretches 230 metres in length and sit 60 metres above the valley floor.

The $1.25 billion Transmission Gully motorways being delivered as a Public Private Partnership (PPP) – the first roading project to be delivered in this way. The Government’s PPP contract is with Wellington Gateway Partnership. This project is a key part of the Wellington Northern Corridor and is one of the most significant pieces of new road construction in New Zealand.

Public Private Partnership
Wellington Northern Corridor


The Transmission Gully motorway will:

  • significantly reduce the number of fatal and serious injury crashes
  • increase capacity and passing opportunities
  • provide a more reliable and safer journey for motorists and one that is better able to resist and recover from earthquakes and storms
  • provide another route between Wellington and the lower North Island
  • reduce traffic congestion and improve safety within communities like coastal communities, such as Plimmerton and Pukerua Bay, by significantly reducing through traffic
  • reduce fuel costs and contribute to economic growth.