Skip to: Navigation | Content | Footer

SH20-1 Manukau Extension

The Manukau Extension project forms a 4.5 kilometre section of motorway linking SH20 Puhinui Interchange through to SH1 and will form the southern section of the Western Ring Route, together with the SH20 Manukau Harbour Crossing project. As well as a triple level interchange between SH20 and SH1 at Manukau, the project also includes new SH20 interchanges at Cavendish Drive and at Lambie Drive. Construction began in June 2006 and is approaching its completion in August 2010.

All projects

Installing beams at night..

Installing beams at night.

Auckland

  • Part of

    Western Ring Route

  • Construction start date

    June 2006

  • Construction completion date

    August 2010

  • Location

    New link between SH1 Redoubt Road Interchange at Manukau city centre and Puhinui Road Interchange on SH20.

  • Project type

    Roads of national significance

  • Project status

    Construction

  • Project contact

    Simon Paton

  • Estimated cost

    $100 million +

  • Project website

    http://www.nzta.govt.nz/projects/manukauextension/

Project purpose

To provide a direct link from SH1 for traffic heading to the airport and central and western suburbs as part of SH20. As part of the southern section of the Western Ring Route, it will increase capacity to help relieve congestion and support economic growth.

Benefits

  • Improved access to and from Auckland International Airport
  • More reliable trip times and improved commute times
  • Considerable relief to local roads within the Manukau city centre area, such as Wiri Station Road, Roscommon Road, Cavendish Drive and Great South Road
  • A direct link from SH1 for traffic heading to the airport and central and western suburbs, via SH20
  • Better rail transport for Manukau by preparatory work on rail link to Manukau city centre
  • Key connection to support future growth at the Wiri and Auckland International Airport business zones, as well as an expected population increase of 40,000 people at the new suburb of Flatbush

Features

  • 4.5 km long four-lane motorway with new interchanges at Cavendish Drive and Lambie Drive and motorway-to-motorway connections to SH1 and SH20
  • Provision for a third lane to be added in each direction in the future (giving six lanes in total)
  • Construction of thirteen bridges
  • Motorway will provide a direct link from SH1 for motorists travelling to the airport
  • Will provide considerable relief to local roads within the Manukau city centre area
  • Includes preparatory work towards the construction of a rail link to the Manukau city centre from the main North Island rail line. NZTA's contractors, Leighton Works, are also constructing the future Manukau Railway Station for ARTA as part of Kiwirail's DART 9 project.