New Zealand State Highway 16

State Highway 16 (SH 16) is a New Zealand state highway linking central Auckland with Wellsford, via Auckland's Northwestern Motorway, Helensville and Kaukapakapa. It provides an alternative to State Highway 1 for traffic travelling between Auckland and parts of Northland from Wellsford northwards.

State Highway 16
Twin Coast Discovery Highway
Route information
Maintained by NZ Transport Agency
Length108 km (67 mi)
Twin Coast Discovery Highway
Major junctions
Southeast endPort of Auckland
  SH 1 "Spaghetti Junction", Auckland
SH 18 Upper Harbour Motorway
Northwest end SH 1 at Wellsford
Auckland, Helensville, Wellsford
Highway system
SH 15SH 17

Within the Auckland metropolitan area, SH 16 mostly runs along the Northwestern Motorway, the major exception being the first 2 km between the Port of Auckland and the Central Motorway Junction. Outside the Auckland metropolitan area, SH 16 is a single carriageway with at-grade intersections.


SH 16 begins in Central Auckland at the corner of The Strand, Tamaki Drive and Quay Street, directly opposite the Port of Auckland. It travels south via The Strand where it reaches the lights at Beach Road and Parnell Rise where it changes to Stanley Street. After one more set of lights at Alten Road, SH 16 becomes the Auckland Northwestern Motorway. The highway travels through the Central Motorway Junction where there are exits to SH 1 both northbound and southbound. The motorway travels west from central Auckland to West Auckland over a causeway crossing Traherne Island and the Whau Estuary. SH 16 then passes through West Auckland and past the junction with SH 18 (Upper Harbour Motorway) where it can be accessed by northbound traffic. The Northwestern Motorway terminates at the roundabout with Brigham Creek Road and Fred Taylor Drive. From here SH 16 reverts to single carriage road. It passes through the communities of Kumeu and Huapai, two areas of significant growth. SH 16 reaches the town of Helensville not long after. From here on SH 16 skirts the Kaipara Harbour on a narrow windy road, eventually returning to meet SH 1 at Wellsford where it terminates.[1]

Route changes

SH 16 north of Helensville to Wellsford was temporarily revoked in 1994. It was reinstated in 1997.[2][3]

Major intersections

Refer to Northwestern Motorway for a complete list of motorway intersections

Territorial authorityLocationkmjctDestinationsNotes
Auckland CouncilPort of Auckland0Quay Street/Tamaki DriveSH 16 begins
Parnell1Parnell Rise
Beach Road
Nicholls Lane
Alten Road
SH 16 becomes Northwestern Motorway
Auckland CBD2 SH 1 south (Auckland Southern Motorway)/Thermal Explorer HighwayManukau, HamiltonWestbound exit and eastbound entrance
3 SH 1 north (Auckland Northern Motorway)/Twin Coast Discovery HighwayNorth Shore, WhangareiWestbound exit and eastbound entrance
4 SH 1 south (Auckland Southern Motorway)/Thermal Explorer Highway – Manukau, HamiltonEastbound exit and westbound entrance
SH 1 north (Auckland Northern Motorway)/Twin Coast Discovery Highway – North Shore, WhangareiEastbound exit and westbound entrance
SH 16/Twin Coast Discovery Highway concurrency begins
Waterview8 SH 20 south (Southwestern Motorway)Waterview Connection
Westgate19 SH 18 east (Upper Harbour Motorway) – North ShoreNorthbound exit and southbound entrance
Whenuapai22Fred Taylor Drive
Brigham Creek Road (and )
Northwestern Motorway ends
Kumeu23Coatesville-Riverhead Highway (Regional Route 28) – Riverhead, AlbanyFormer route for SH 18
Helensville48Parkhurst Road – Parakai, South Kaipara Head
Wellsford 108 SH 1 north (Rodney Street)/Twin Coast Discovery Hwy North – Whangarei, Kaitaia
SH 1 south (Rodney Street)/Thermal Explorer Highway South – Warkworth, Auckland
SH 16 ends

See also


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