SH18 Hobsonville Deviation and SH16 Brigham Creek Extension

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Project introduction

The State Highway 18 Hobsonville Deviation project is a 6 kilometre, four-lane motorway from the end of the Northwestern Motorway at Hobsonville Road to the western end of Upper Harbour Bridge in Hobsonville.

  • Estimated project dates

    Sep 2008–Sep 2011
  • Estimated project cost

    $100 million +
  • Project status



The Hobsonville Deviation Motorway provides an alternative to Hobsonville Road, to help reduce congestion and improve motorist and pedestrian safety. New interchanges have been built at Hobsonville Road, Trig Road, Brigham Creek Road and Squadron Drive. A new bridge at Clarks Lane for pedestrians and cyclists gives safe passage over the motorway. There is also be provision for future bus shoulder lanes.


  • Provides a better connection between the west and north shore of Auckland.
  • Increased capacity for motorists travelling to and from the northwest, including Albany, Greenhithe, Hobsonville, Massey and Kumeu.
  • Improved travel times.
  • Reduced congestion on Hobsonville Road and SH16 north of Don Buck Road.
  • Supports economic development and planned growth in the northwest region.
  • Gives access to the new housing development at Hobsonville airbase (Hobsonville Point).
  • As part of State Highway 18 Upper Harbour Motorway, forms the northern section of the Western Ring Route.

About the project

The State Highway 18 Hobsonville Deviation and State Highway 16 Brigham Creek Extension project is part of the new Upper Harbour Motorway. The Upper Harbour Motorway has been under construction since 2006 to replace the current State Highway 18 that runs along Upper Harbour Drive and Hobsonville Road.

State Highway 18 Upper Harbour Motorway extends from the intersection of Upper Harbour Highway and Paul Matthews Road in the east, to the end of the Northwestern Motorway (State Highway 16) at Westgate in the west. It passes through the developing residential areas of Greenhithe and Hobsonville.

The motorway is being built in three sections – Greenhithe Deviation, Upper Harbour Bridge duplication, and Hobsonville Deviation. The last section of the motorway, Hobsonville Deviation, is now under construction and scheduled to be completed in September 2011.

  • 6 km, four-lane State Highway 18 motorway through Hobsonville.
  • 3 km, four-lane State Highway 16 motorway to Brigham Creek Road.
  • Four interchanges at Hobsonville Road, Trig Road, Brigham Creek Road (north and south) and Squadron Drive.
  • One flyover at Hobsonville Road to connect State Highway 16 to the new State Highway 18.
  • Five bridges at Hobsonville Road, Trig Road, Brigham Creek Road, Squadron Drive and Totara Creek.
  • One cable stay pedestrian/cyclist bridge at Clarks Lane.
  • Four new roundabouts along Brigham Creek Road.
  • Sinton Road extended to a new roundabout with Brigham Creek Road.

Hobsonville motorway video

Watch the video about the Hobsonville motorway.


  • Construction started: October 2008
  • Construction completed: August 2011

Our partners on this project