State Highway 16 (New Zealand)

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State Highway 16
Twin Coast Discovery Highway
SH16 viewed from the Te Atatu Road overbridge during New Zealand's COVID-19 lockdown
Route information
Maintained by NZ Transport Agency
Length	108 km (67 mi)
Tourist routes	Twin Coast Discovery Highway
Major junctions
Southeast end	Port of Auckland
Major intersections	SH 1 south (Auckland Southern Motorway) at Central Motorway Junction SH 1 north (Auckland Northern Motorway) at Central Motorway Junction SH 20 (Southwestern Motorway) at Waterview SH 18 (Upper Harbour Motorway) at West Harbour
Northwest end	SH 1 (Rodney Street) at Wellsford
Location
Country	New Zealand
Primary destinations	Auckland, Helensville, Wellsford
Highway system
New Zealand state highways Motorways and expressways List
← 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 SH 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 a single carriageway with at-grade intersections.