Manukau Harbour Crossing and the Western Ring Route

The SH20 Manukau Harbour Crossing (the Project) is a key part of the Western Ring Route. Once completed, the Western Ring Route will provide a genuine alternative to SH1 between Manukau City and Albany via SH20, SH16 and SH18.

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It will provide quicker and safer travel between Waitakere, Auckland and Manukau Cities. The project will relieve congestion on the central motorway network and provide a strategic alternative route across the region.

Transit plans to actively manage traffic flows on both the Western Ring Route and SH1 to contribute to the long-term sustainability of the network overall and to provide more reliable travel times.

Other projects forming part of the Western Ring Route are:

  • SH20 to SH1 Manukau Extension
  • SH20 to Mt Roskill Extension
  • SH20 Waterview Connection
  • SH16/18 Upper Harbour Corridor
Western Ring Route The Western Ring Route

To fully realise the benefits of the Project, it must be considered as an integral part of the wider corridor upgrade in providing a strategic alternative to SH1.

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Western Ring Route

Latest News

SH20 Manukau Harbour Crossing traffic bulletin

Transit New Zealand advises motorists of the following upcoming closures for work on the Southwestern Motorway (SH20)
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FAQs

What is the Manukau Harbour Crossing Project? The project is a key part of the Western Ring Route. Once completed, the Western Ring Route will link the cities of... More

When will construction start? Construction is scheduled to start in 2008 and is expected to be completed by 2011.

How much will the project cost? Estimated cost - is in the $100M+ category of Transit New Zealand's 2006/07-2015/16 10-year State Highway Forecast.