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​State Highway 20 (SH20), known as the Southwestern Motorway, starts at the interchange with SH1, in Manukau City and currently ends at the roundabout with Sandringham Road and Maioro Street in Mt Roskill, Auckland City.

Interchanges include (north to south):

  • Maioro Street
  • Sandringham Road
  • Dominion Road
  • Hillsborough Road
  • Queenstown Road
  • Neilson Street
  • Mahunga Drive/Rimu Road
  • Walmsley Road/Coronation Road
  • SH20A/Airport
  • Massey Road
  • SH20B/Puhinui Road
  • Cavendish Drive
  • Lambie Drive
  • SH20/SH1

​​SH20 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.


​SH20A (George Bolt Memorial Drive) is the motorway link from State Highway 20 to the Auckland International Airport.

Key intersections include (north to south):

  • Bader Drive
  • Kirkbride Road/Massey Road
  • Montgomerie Road
  • Tom Pearce Drive


​SH20B (Puhinui Road) is the motorway link from Puhinui Road/Roscommon Road/SH20 to the Auckland International Airport.

Key Intersections include (east to west):

  • Manukau Memorial Gardens
  • Prices Road