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​State Highway 18 (SH18), known as Upper Harbour Highway, starts at the interchange with State Highway 1 in North Shore City and ends at the Westgate/Hobsonville Road interchange.

Interchanges include (east to west):

  • Albany Highway
  • Greenhithe Road
  • Tauhinu Road
  • Squadron Drive
  • Brigham Creek Road
  • Trig Road
  • Hobsonville Road

SH18 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.