About this Project

Key Facts

Four-lane motorway with provision for another lane to be added to each side in the future (giving six lanes in total)
4.5km in length
Three interchanges with motorway-to-motorway connections to SH20 and SH1 at Manukau City
Twelve bridges (and one temporary bridge)
268,000 m2 of pavement
140 ha site area
920,000 m3 of earthworks
7 sedimentation ponds
16.8 km of drainage
Estimated cost - $210m
Construction commenced in June 2006
Construction completed by August 2010

Key Features

The new motorway link is made up of two lanes in each direction. The design also allows for a third lane to be added to each side in the future, giving six lanes in total.

Within this section of motorway, two grade separated interchanges at Nesdale Ave and Lambie Drive are included - as well as motorway-to-motorway connections to SH20 and SH1 at Manukau City.

The work includes five motorway crossings over local roads and streams, as well as the main North Island rail line.

Nesdale Ave Interchange

Extended to pass under the new motorway and across a diversion of the Puhinui Stream - to join the existing SH20 at Roscommon Road
Major entry and exit point for traffic coming to and from the new motorway
Construction is taking place in five stages to maintain the flow of traffic past the construction site
Earthworks began in October 2006 and will continue until December 2010

Crossing over main North Island rail line (NIMTR)

A bridge is being built to cross the North Island Main Trunk rail line
The bridge will have two decks but share piers along the length
Four spans will carry the motorway between 2 large embankments for a total of 120 metres
Earthworks will form a platform alongside the motorway east of the bridge for the future rail link to the Manukau city centre

Lambie Drive Interchange

A new bridge will allow Lambie Drive to pass over the new motorway
A rail underpass is being constructed for the future rail link to Manukau city centre
Main entry and exit point for Manukau Central Business District traffic to access SH1 and SH20
Traffic going to and from Manukau city centre will use this as a major access point for the completed motorway in both directions
Construction is underway and traffic shifts will take place in Lambie Drive

Barrowcliffe Place (Manukau City Council)

Construction work will allow direct bridge access from the undeveloped area south of Wiri Station Road, across the motorway to Manukau city centre
Includes a local road bridge and pedestrian access

Wiri Station Road

A new bridge is being constructed to pass over the motorway

Great South Road

A bridge is being constructed so the new motorway can pass under Great South Road
Construction has started and is taking place in two stages, with traffic shifted around the work as needed

SH1 - SH20 Interchange

The SH1 and SH20 motorways will join at this triple-level interchange
Features a 240 metre curved flyover with 10 spans
Existing exit ramp from SH1 to Great South Road will be re-aligned
Existing Redoubt Road on-ramp to SH1 will be replaced
Traffic travelling from Auckland and from the south will have direct access to SH20, to Auckland International Airport and the Western Ring Route
Traffic travelling from SH20 will be able to join SH1 travelling both north and south
Construction is taking place in three stages, from early 2007 until late 2009

Manukau rail link (Manukau City Council)

The project includes preparatory work towards the construction of a rail link to the Manukau city centre from the main North Island rail line - adjacent to the motorway. A Manukau City Council and ONTRACK funded project, it will form a 1.8 kilometre connection between the existing main trunk line at Wiri and a new station at Manukau city centre, to improve passenger services in Manukau City.

At the same time as the motorway project work, Manukau City Council is also progressing with a separate project to connect Nesdale Ave with Cavendish Drive.

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Benefits

The Manukau Extension project will deliver the following 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 Cavendish Drive and Great South Rd
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

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Timeline

Construction started - June 2006
Construction completed - August 2010