SH20 Mount Roskill
SH20 Mount Roskill Extension 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.
Transit plans to actively manage traffic flows on both the Western Ring Route and SH1 to contribute to long-term sustainability of the network overall and to provide more reliable travel times.
Transit New Zealand is constructing the $186M State Highway 20 Mt Roskill Extension. This four-lane, four kilometre motorway extension will provide an alternative regional route through greater Auckland, linking the cities of Manukau, Auckland, Waitakere and North Shore.
The extension itself will also provide considerable relief to local roads in the Mt Roskill and Avondale areas that currently carry through traffic from the Southwestern Motorway (SH20) to the CBD and Auckland’s western suburbs.
Work on the SH20 Mt Roskill Extension underlines Transit’s balanced approach to addressing Auckland’s transport needs through:
- the construction of a new state highway
- provision for public transport infrastructure
- creation of alternative routes.
Latest News
View new aerial photos from March 2009 More
New Mt Roskill Extension opens PDF (1.04MB)
New SH20 Mt Roskill Extension motorway opens The NZ Transport Agency today opened the SH20 Mt Roskill Extension motorway, the latest link in Auckland’s Western Ring Route. More
FAQs
Will the extension help to ease Auckland's congestion? The extension of the Southwestern Motorway (SH20) through Mt Roskill, and later through Avondale, will help to ease congestion on Auckland motorways by providing motorists with alternative routes north and south to SH1. More
Will you be planting trees? Yes. Landscaping and planting are integral parts of the project. Around 3,400 trees will be planted, many of them native, as well as approximately 260,000 shrubs.