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​State highway 1

State Highway 1 (SH1) is the main route through Auckland if you are travelling north or south and includes the Auckland Harbour Bridge, the Northern Gateway Toll Road and tunnels. It is known north of the bridge as the Northern Motorway and south of the bridge as CMJ (Spaghetti Junction) and the Southern Motorway.

 Northern Motorway

​The Northern Motorway starts at the Puhoi turn-off and ends at the northern abutment of the Auckland Harbour Bridge.

Key interchanges  include (north to south):

  • Waiwera (JHT)
  • Orewa
  • Silverdale
  • Oteha Valley Road
  • Greville Road
  • Upper Harbour Highway
  • Tristram Avenue
  • Northcote Road
  • Esmonde Road
  • Onewa Road
  • Stafford Road
  • Auckland Harbour Bridge

The Auckland Harbour Bridge connects the north to the south and is one of the most strategically important bridges in New Zealand. The Auckland Harbour Bridge is also one of the best maintained bridges in the world. As part of the ongoing maintenance programme, the box girders (clip-ons) are undergoing a strengthening upgrade to ensure they stay in good condition.

 Central Motorway Junction

​The Central Motorway Junction (CMJ), known to most as Spaghetti Junction starts at the southern abutment of the Auckland Harbour Bridge and ends at Khyber Pass Road. It links the Northern motorway, Northwestern Motorway (SH16), Southern Motorway and Port.

Key interchanges include (north to south):

  • Shelly Beach Road/Curran Street
  • Fanshawe Street
  • Cook Street
  • Wellington Street
  • Nelson Street/City Centre
  • SH16/Northwestern Motorway
  • Symonds Street
  • Symonds Street/Wellesley Street/Port
  • SH16/Port

 Southern Motorway

​The Southern Motorway starts at Khyber Pass Road in Auckland City and ends at the State Highway 2 (SH2) interchange, at Pokeno in Franklin District.

Key interchanges include (north to south):

  • Khyber Pass Road
  • Gillies Avenue
  • St Marks Road
  • Market Road
  • Greenlane East
  • Tecoma Street
  • Ellerslie Panmure Highway
  • South Eastern Highway
  • Mt Wellington Highway
  • Princes Street/Otahuhu
  • Highbrook Drive
  • East Tamaki Road
  • Te Irirangi Drive
  • Manukau
  • SH1/SH20
  • Hill Road/Manurewa
  • Manurewa/Takanini
  • Papakura
  • SH22/Drury
  • Ramarama
  • Bombay
  • Beaver Road
  • Ridge Road
  • Razorback Road
  • SH2

Two major viaducts on SH1 are currently undergoing major upgrades, Victoria Park Tunnel in CMJ and Newmarket Connection on the Southern Motorway.