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Project introduction

The Manukau Extension project (completed January 2011) 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.

  • Estimated project dates

    Jun 2006–Aug 2010
  • Estimated project cost

    $100 million +
  • Project type

    Roads of National Significance
  • Project status

    Completed

Purpose

To provide a direct link from State Highway 1 for traffic heading to Auckland Airport and central and western suburbs. 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 Airport.
  • More reliable trip times and improved commute times.
  • Considerable relief to local roads within the central Manukau area, such as Wiri Station Road, Roscommon Road, Cavendish Drive and Great South Road.
  • A direct link from State Highway 1 for traffic heading to the airport and central and western suburbs, via State Highway 20.
  • 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 Airport business zones, as well as an expected population increase of 40,000 people at the new suburb of Flatbush.

About the project

This project was completed in January 2011.

The motorway has replaced Wiri Station Road as the main link from Manukau city centre to the Southwestern Motorway. The 4.5 kilometre motorway forms the southern section of the Western Ring Route, along with the SH20 Manukau Harbour Crossing project. Construction began in June 2006.

Project features

  • 4.5-km-long four-lane motorway with new interchanges at Cavendish Drive and Lambie Drive and motorway-to-motorway connections to State Highway 1 and State Highway 20.
  • Provision for a third lane to be added in each direction in the future (giving six lanes in total).
  • Construction of 13 bridges.
  • Motorway provides a direct link from State Highway 1 for motorists travelling to the airport.
  • Provides 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. The Transport Agency's contractors, Leighton Works, are also constructing the future Manukau Railway Station for ARTA as part of Kiwirail's DART 9 project.
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