Northern Corridor Improvements

Project Information

This project will provide better links for North Motorway (SH1) travelers in Auckland and improve transport options on the north shore for freight, cars, pedestrians and cyclists. It includes a new motorway connection between SH1 and SH18, opening up access to the Western Ring Route and airport. 

Work Notifications


MAY 2023

Asphalt nightworks

northern corridor improvements

Rosedale bridge night WORKS NOTIFICATION 05/04/2022



  • Provide a new, continuous motorway route from the North Shore to and from the Western Ring Route and beyond, as an alternative to travelling on SH1 through the central city
  • Better link the people of the North Shore to their new neighbours in growth areas in the North-West
  • Widen SH1 in both directions for those travellers who stay on SH1 through the central city.
  • Separate local traffic and high speed motorway-through traffic along Upper Harbour Highway (SH18), easing congestion; creating better links; reducing harm to local communities; and supporting future freight and economic growth
  • Improve access in and out and around Albany
  • Create new reliable, safe services for bus users, walkers and cyclists

Project Updates

JUNe 2022

mAY 2022

april 2022

MARCH 2022

To view previous NCI Project Updates, please click here.


To help facilitate interregional travel between Auckland and Northland by allowing the full benefits of the Western Ring Route to be realised by upgrading the SH18/1 connection.

The Northern Corridor programme consists of several projects:

SH1 - Upper Harbour Highway to Greville Road Northbound 3-laning and bus shoulder widening
The first of the Northern Corridor projects to begin, the Upper Harbour Highway to Greville Road Northbound 3-laning project completed construction in June 2015. This aspect of the longer term programme was accelerated as it would provide interim relief for the community and increase capacity while the rest of the rest of the programme continued to be investigated and designed. Key features of this project included constructing an additional northbound lane on SH1 between the Upper Harbour Highway on-ramp and the Greville Road off-ramp, upgrading the intersections at the Greville Road interchange, and building a dedicated shared path for walkers and cyclists to travel safely through the area.
SH1/SH18 Interchange Upgrade
This part of the main works will build a new direct motorway connection between SH1-S18 near Constellation Drive, and upgrade Upper Harbour Highway (SH18, currently a signalised 80km speed zone) to full motorway standard, all the way from the new connection through to the Albany Highway bridge. The new connection and new on and offramps will separate motorway-through traffic from local traffic and improve local road congestion, including at Constellation Drive.

This project forms the final missing link of Auckland’s new Western Ring Route.
Walking and cycling
The current congestion and conflict of motorway-through traffic and local access traffic through Upper Harbour Highway (SH18), as well as rapid growth in the industrial area at North Harbour has created a divide between the local community to the west and south, and the industrial area to the north. There is limited accessibility for safe walking and cycling around the highways and to and from the busway. Improving facilities and encouraging these ‘active modes’ of transport is a key project within the Northern Corridor project. The project will deliver over 7kms of new offroad Shared Use Paths and a wide range of local road and park connections, helping to increase accessibility to the bus stations and key destinations. 

The project is also delivering Tirohanga Whanui (the Spencer Rd to Albany walking and cycling bridge), in partnership with Watercare. This bridge will reconnect the East Coast Bays with Albany's employment, retail and schools area with a safe, offroad crossing point.
Northern Busway Extension to Albany
The NCI will also include an extension of the dedicated Northern Busway from Constellation Bus Station all the way through to Albany Bus Station, improving journey time reliability and time savings for passengers on bus services. As part of the project, upgrades will also undertaken at Constellation Bus Station and bus access at Albany Bus Station. 

Auckland Transport is also investigating an additional bus station in Rosedale, which would increase access to bus services for a key employment area.
Rosedale Busway Station
Waka Kotahi and Auckland Transport (AT) are working together to develop plans for a new busway station in Rosedale, to be constructed alongside the new Northern Busway Extension, improving transport options in this area.

Auckland Transport is also investigating an additional bus station in Rosedale, which would increase access to bus services for a key employment area.
Previous slide
Next slide



Please contact:

Emma Cushnie – Community Engagement Manager