New Zealand State Highway 16

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State Highway 16 NZ.svg

State Highway 16
Twin Coast Discovery Highway
Route information
Maintained by NZ Transport Agency
Length: 108 km (67 mi)
Twin Coast Discovery Highway
Major junctions
Southeast end: Port of Auckland
  SH 1 "Spaghetti Junction", Auckland
SH 18 Upper Harbour Motorway
Northwest end: SH 1 at Wellsford
Auckland, Helensville, Wellsford
Highway system
SH 15 SH 17

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.

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 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[edit]

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

Major intersections[edit]

Refer to Northwestern Motorway for a complete list of motorway intersections

Territorial authority Location km jct Destinations Notes
Auckland Council Port of Auckland 0 New Zealand road sign W10-4.svg Quay Street/Tamaki Drive SH 16 begins
Parnell 1 New Zealand road sign W10-4.svg Parnell Rise
Beach Road
New Zealand road sign W10-4.svg Nicholls Lane
Alten Road
SH 16 becomes Northwestern Motorway
Auckland CBD 2 Australia GE2-3.svg SH 1 south (Auckland Southern Motorway)/Thermal Explorer HighwayManukau, Hamilton Westbound exit and eastbound entrance
3 Australia GE2-3.svg SH 1 north (Auckland Northern Motorway)/Twin Coast Discovery HwyNorth Shore, Whangarei Westbound exit and eastbound entrance
4 Australia GE2-3.svg SH 1 north (Auckland Southern Motorway)/Thermal Explorer Highway – Manukau, Hamilton Eastbound exit and westbound entrance
Australia GE2-3.svg SH 1 south (Auckland Northern Motorway)/Twin Coast Discovery Hwy – North Shore, Whangarei Eastbound exit and westbound entrance
SH 16/Twin Coast Discovery Highway concurrency begins
Waterview 8 Australia GE2-3.svg SH 20 south (Southwestern Motorway) Waterview Connection. Expected to be open April 2017
Westgate 19 Australia GE2-3.svg SH 18 east (Upper Harbour Motorway) – North Shore Northbound exit and southbound entrance
Whenuapai 22 New Zealand road sign W11-1.svg Fred Taylor Drive
Brigham Creek Road (and State Highway 18 NZ.svg)
Northwestern Motorway ends
Kumeu 23 New Zealand PW-11 (right).svg Coatesville-Riverhead Highway (Regional Route 28) – Riverhead, Albany Former route for SH 18
Wellsford 108 New Zealand road sign R2-1.svg 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[edit]