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The Western Ring Route Projects

Updated: 16 October 2014

New motorway sections will connect to existing roads creating a seamless route between Manukau city centre and Albany on the North Shore. Below is a list of the projects with more information and links to the individual project websites.

Lincoln Road Interchange on the Northwestern Motorway will be upgraded to improve congestion and motorist safety.

Under construction:

To be constructed:

Completed and open



SH18 Greenhithe Deviation

Construction start: September 2003
Construction finish: December 2007

  • Four-lane divided motorway from Paul Matthews Drive in the east to the beginning of Upper Harbour Bridge in the west
  • 5.5 km in length
  • Three interchanges and bridges: Albany Highway, Tauhinu Road, Greenhithe Road
  • Together with Upper Harbour Bridge, the motorway creates a new connection between Waitakere and North Shore cities
  • Cost - $110 million
  • Opened 2006


  • The project provides a better connection between Waitakere City and North Shore City
  • It is one of three projects as part of the Upper Harbour Motorway (SH18) that form the northernmost section of the Western Ring Route – the strategic alternative route linking Albany and Manukau via SH18, SH16 and SH20
  • The new connection increases capacity for motorists travelling to/from the northwest, particularly between Albany and Greenhithe in North Shore City,
  • Greenhithe Deviation provides an easy connection to SH1 and Albany Highway and helps to reduce congestion on local roads in Greenhithe and surrounding areas.

The interchanges

Albany Highway Interchange

  • Features a 37 m long bridge with 2 spans and 6 lanes which crosses over the new motorway
  • Interchange provides access for eastbound traffic travelling to join the Northern Motorway (SH1), and westbound traffic travelling from the North Shore to Waitakere
  • Interchange is the major entry and exit point for motorists travelling into the Albany industrial area

Greenhithe Road Interchange

  • Features a 42 m long bridge with 2 spans carrying Greenhithe Road over the motorway
  • Interchange is the main eastern access into the Greenhithe area from the motorway
  • Traffic travelling from the North Shore can now exit the motorway onto Greenhithe Road
  • Traffic travelling from Greenhithe can now join the motorway and travel to Albany and SH1.

Tauhinu Road Interchange

  • Features a 47 m long curved bridge with 2 spans to carry Tauhinu Road over the motorway
  • New motorway temporarily ends at this point, until Hobsonville Deviation is completed in 2012
  • Interchange is the main western access into the Greenhithe area from the motorway
  • Traffic from Hobsonville can exit the motorway onto Tauhinu Road and Upper Harbour Drive
  • Traffic from Greenhithe can join the motorway at Tauhinu Road to travel west over Upper Harbour Bridge to Waitakere City and the Northwestern Motorway (SH16). 


SH18 Upper Harbour Bridge Duplication

Construction start: February 2003
Construction finish: December 2006
Cost: $35 million


  • The bridge links Waitakere City and North Shore City
  • The bridge is one of three projects that form the northernmost section of the Western Ring Route – the strategic alternative route linking Albany and Manukau via SH18, SH16 and SH20
  • The new bridge increases capacity for motorists travelling to/from the northwest, between Hobsonville in Waitakere City and Albany in North Shore City
  • The new Upper Harbour Bridge features five lanes – three lanes east towards Greenhithe and two lanes west towards Hobsonville. The extra capacity helps relieve congestion on Upper Harbour Drive


The NZ Transport Agency is working to protect and enhance the natural, social and physical environment around the project area. This commitment to responsible resource management means comprehensive procedures were put in place to mitigate the effects of the project.

Coastal Marine area

Given the project’s location in the environmentally sensitive catchment of the Upper Waitemata Harbour, a number of innovative construction practices were adopted to minimise the impact on the marine environment.

  • Mudcrete – a mixture of cement and soft marine mud at the site was used to complete the foundations below high-tide level on the new Upper Harbour Bridge. It was used in the construction of the widened causeway at the western end of the bridge.
  • 1,400 tonnes of cement were added to 14,000 cubic metres of marine mud to produce the material. By using what is already on site, the mudcrete material reduces the need to import and dispose of excess material.

Project Partners

Fletcher Construction Company

The Fletcher Construction Company is the pre-eminent general contractor in New Zealand and the South Pacific. It has unrivalled depth and breadth of experience across all facets of the construction industry.


Beca is an international employee-owned engineering and related consultancy services group. Their range of services covers engineering, planning, project management, architecture, GIS and surveying, cost estimating, asset management and valuations.


SH16 Royal Road Interchange

Construction start: TBA
Construction finish: TBA
Cost: TBA

Key features & benefits

  • Overbridge widened to improve capacity
  • Longer and safer ramps
  • Upgraded cyclist and pedestrian facilities


SH16 Westgate Pedestrian and Cycle bridge - completed

Construction start: February 2012
Construction finish: January 2013
Cost: $6 million
Contact us

Westgate Pedestrian and Cyclist bridge Westgate Pedestrian and Cyclist bridge ribbon cutting
(Click on an image to see a larger version.)

Bright new NZTA link improves community safety in Auckland (31 January 2013)
Walkers and cyclists now have safer access across Auckland's busy Northwestern Motorway (State Highway 16) with the official opening today of the Westgate Pedestrian and Cycle Bridge by the NZ Transport Agency and Auckland Transport.

Key features

  • New pedestrian and cycle bridge over the Northwestern Motorway (SH16)
  • Connects Manutewhau Walk Reserve in West Harbour to the Westgate Shopping Centre in Massey
  • The bridge is 209 metres long, 3 metres wide and curved in shape
  • Includes ramps at each end of the bridge for mobility users


  • Provides a safe, new route over the motorway for pedestrians, cyclists and local schoolchildren travelling to Westgate Shopping Centre from the nearby suburbs
  • Provides direct access to the shopping centre, libraries and the developing town centre
  • Features special lighting to highlight the bridge, improving safety at night

Urban design & the environment

  • Enhancements of the reserve include landscaping and replacing old pine trees with native plants and trees
  • The bridge will be painted yellow, complementing the nearby yellow Clarks Lane Pedestrian and Cycle Bridge, also designed by Jasmax
  • Yellow LED buttons will illuminate the piers and handrail on the bridge
  • New street lights will be installed at the end of the shared pedestrian/cycle path



SH20 Maioro Street Interchange

Construction start: May 2010
Construction finish: March 2012
Cost: $40 million

Key features

  • Half diamond interchange that will connect SH20 Mt Roskill Extension to the SH20 Waterview Connection
  • Maioro Street realigned and extended north to a new signalised intersection with Stoddard Road
  • Eventually the interchange will be developed into a full diamond layout with ramps for both north and southbound traffic


  • Design accommodates any planned expansion of SH20 in the future from four to six lanes
  • Creates a seamless connection between the existing and future Southwestern Motorway
  • Local connections and motorway access established for residents of New Windsor, Mt Roskill and Wesley

Urban design, environment and public transport

  • Semi-permanent stormwater treatment pond collects and treats motorway runoff
  • A further section of SH20 cycleway added to take cyclists from Ernie Pinches Footbridge through to Maioro Street
  • Additional landscaping and trees throughout the interchange