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Auckland Transport

Huapai Triangle Special Housing Area Huapai Triangle Special Housing Area

Auckland Transport will soon commence the first of two related projects to upgrade roading infrastructure at Kumeu and Huapai to serve the new Huapai Triangle Special Housing Area (SHA) in the north-west sector of Auckland.

Project status: Design
Project zone: West

Project overview

The SHA comprises 1200 dwellings including a retirement village.

It is located in a triangle of land (Huapai Triangle) bounded by the Auckland-Northland Railway to the north, which runs parallel to SH16, Station Road to the north-west and Nobilo Road to the north-east.

Upgrades will include the following areas:

  • The connection between SH16, Station Road and Tapu Road at Huapai where the existing T intersections will be replaced by a large gyratory (roundabout) intersection. Road building is expected to commence on this upgrade in 2021.
  • The intersection of SH16 and Access Road. Works for this upgrade is expected to commence in 2020.
  • CABRA Developments Ltd, will partially upgrade Station Road, between Nobilo Road and the southern links to the new gyratory intersection. It will also fund the safety upgrade by KiwiRail of the Access Road level crossing.

These indicative dates are subject to funding.


  • Increased road capacity for traffic volumes generated by the Huapai Triangle Special Housing Area (SHA) in north-west Auckland.
  • Future proofed accessibility to the area.
  • Improved safety at controlled intersections and fair interchange of traffic between side roads and SH16.
  • Better moderated flow of SH16.
  • Improved walking and cycling routes.


  • SH16/Access Road construction during 2020.
  • Station Road connection (Gyratory) – Detailed Design – 2020.


The total budget for the two upgrades is $37.4 million with AT and NZTA to share the cost. The AT Board has approved the project subject to finalisation of this aspect.

Project details

The principal connection to SH16 for SHA traffic is projected to be via Station Road north to SH16. An alternative route is to the south via Access Road. This intersects SH16 at Kumeu.

The primary purpose of the upgrades for which AT is responsible is to upgrade the capacity of the two intersections and their ability to cater for:

  • Increased volumes of traffic on SH16.
  • Improved safety and better management of traffic between SH16 and the three side roads (Station, Tapu and Access Roads).
  • Cabra Developments Ltd have upgraded Station Road between Nobilo Road and the pedestrian crossing near Huapai District School.

Huapai - the Gyratory - currently under review

The gyratory (large traffic roundabout) to connect Station Road, Tapu Road and SH16 is at concept stage and has been agreed in principle by Auckland Transport, New Zealand Transport Agency (NZTA), KiwiRail and Auckland Council. 

The state highway will be retained in its existing position and will be used for east-bound traffic only. Tapu Road will continue to connect this section of the state highway. A new two-lane road will be built on a new alignment to take westbound traffic. The new west bound lanes will curve away from the eastbound lanes just before the Tapu Road connection and cross a new bridge over the railway then curve back to join the eastbound lanes where Station Road currently intersects with State Highway 16. Station Road will connect to the new westbound lanes midway between the two ends of the deviation.

This layout allows SH16 traffic to flow between east and west and for traffic to flow between Station Road and Tapu Road. New off-road walking and cycling facilities will be built around the new structure.

The gyratory has signalised intersections at its entrances and exits and also where Station Road and Tapu Road connect. These signals will better manage the flow of SH16 traffic between east and west and the flow of traffic joining or leaving the state highway from Station Road and Tapu Road. They will also provide controlled crossing points for pedestrians and cyclists.

The new layout for the intersection.

Huapai - the Gyratory 1

Huapai - the Gyratory 2

Huapai - the Gyratory 3

Kumeu - SH16 Access Road intersection

Improvements planned to SH16 and Access Rd intersection will enable:

  • A left turn lane allowing turning traffic and through-traffic to be stacked out of each other’s path, by providing west bound traffic on SH16.
  • Improved Access Road outlet to SH16 between the railway and limit line:
    • with a new left turn lane,
    • with improved warning of the approach of trains.
  • A pedestrian maze in Access Road on the eastern side of the level crossing.
  • Further developments to the level crossing are planned between KiwiRail and SHA developers CABRA Developments Ltd. CABRA Developments Ltd. are funding KiwiRail’s safety upgrades to the level crossing.
  • A new left-turn slip lane on the southern side of SH16 for traffic turning to Access Road.
  • New walking and cycling facilities beside the new lane.
  • Upgraded Access Road at the SH16 intersection between the level crossing and the limit line.
  • Widening the western side.
  • A new left turn lane between the new western kerb and a new traffic island which will reduce the distance pedestrians and cyclists are required to travel to cross of SH16 (north/south) at this point therefore enhancing safety.
  • Providing a controlled east-west pedestrian and cycle crossing over Access Road.

The space for widening SH16 was obtained by reducing the width of the walking/cycle facilities on the southern side of SH16 and by shifting the roadway northwards to occupy the planted median on the northern side of SH16, which forms the boundary between SH16 and a service road to its immediate north. This has been achieved without reducing parking in the service road but by rearranging parking and traffic flows.

Huapai Triangle Special Housing Area Layout of Access Road intersection
Improvements planned to SH16 and Access Road intersection.

Plan for SH16 and the Access Road intersection

Huapai triangle

Huapai triangle

Images: Artist's impression of the SH16/Access Road intersection.

Additional information about the SHA

The Huapai Triangle Special Housing Area Roading Infrastructure Upgrade Project (Huapai SHA Project) responds to a requirement created by the Huapai Triangle Special Housing Area (SHA) of 1200 dwellings.

This SHA was permitted by the Government and Auckland Council in 2013. Signatories to the resulting contract were:

The Consenting Authorities:

  • Government.
  • Auckland Council.

The developers:

  • Todd Holdings Ltd. 
  • CABRA Developments.

Todd Developments has since withdrawn from the Special Housing Area, which is now being delivered by solely by CABRA.

The Infrastructure providers/owners:

  • Auckland Transport.
  • NZTA.
  • KiwiRail.

History of the SHA

In 2014 the Government entered into a Housing Accord with Auckland Council to build Special Housing Areas (SHAs). The first of these was the Huapai Triangle Special Housing Area which provided for the building of 1200 dwellings in a triangle of land at Huapai, bounded by Station Road, Nobilo Road and the Auckland – Northland Railway.

In 2015, there was an agreement between Auckland Council, NZTA, KiwiRail, AT and the then developers, Todd Property Group and CABRA Developments to upgrade the existing roading infrastructure to support the Huapai SHA development (Todd subsequently withdrew leaving CABRA to develop the whole site).

An Infrastructure Funding Agreement (IFA) was signed in 2017 with CABRA. This creates a broad time-frame which AT must deliver in stages of the agreed works. At the time of the concord to create the SHA, a plan was agreed for upgrading of roading infrastructure to serve the new SHA.


AT was originally responsible for the upgrade of Station Road however it is now the responsibility of CABRA to deliver this element of the work. This is now only a partial upgrade.

The original intention to re-align Station Road to form a cross roads with Tapu Road and SH16 (and widen the adjacent SH bridge over the railway) proved impractical to design due to the proximity of the railway line to the intersection.

After extensive consultation with NZTA an agreed design was produced in 2018. However, shortly afterwards, KiwiRail exercised a right (provided for in the original multi party agreement), that if the rail bridge was to be upgraded, KiwiRail required it to be future proofed for triple tracking and electrification. Among other consequences this would have required raising the bridge deck by 1.8 metres severely compromising the Tapu Road/Station Road/SH16 intersection design. The cost of accommodating this in terms of property purchases, construction cost and community disruption was too high.

AT then abandoned the original concept design for the intersection in favour of the gyratory. The gyratory layout can be delivered within budget and the majority of the layout can be built “off-line”, thereby minimising traffic impacts during construction.


Upgrade plans:

  • Widening of SH16 on the eastern approach to the intersection with Access Road.
  • A new left-turn slip lane on the southern side of SH16 for traffic turning to Access Road.
  • New walking and cycling facilities beside the new lane.
  • Upgrade Access Road at the SH16 intersection between the level crossing and the limit line.

Over time events have led to significant changes in the plans for Station Road, described above, resulting in the need for extra funding. As a consequence the AT Board has approved an increase in (RLTP) budget to $37.4 million.

For more information on this project

Contact Auckland Transport