New Zealand State Highway 16

State Highway 16
	Twin Coast Discovery Highway
	290px
Route information
	Maintained by New Zealand Transport Agency
Length:	108 km (67 mi)
Tourist; routes:	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
Location
Primary; destinations:	Auckland City, Waitakere, Helensville
Highway system

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State Highway 16 (SH 16) is a New Zealand state highway linking Auckland City 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.

Major intersections

Territorial authority	Location	km	Destinations	Notes
Auckland City	Port of Auckland	0	Quay Street/Tamaki Drive	SH 16 begins
	Auckland CBD	1	SH 16 becomes Northwestern Motorway
		2	SH 1/Thermal Explorer Highway South Southern Motorway Manukau, Hamilton	Westbound exit and eastbound entrance
		3	SH 1/Twin Coast Discovery Hwy North Northern Motorway North Shore, Whangarei	Westbound exit and eastbound entrance
		4	SH 1/Thermal Explorer Highway South Southern Motorway Manukau, Hamilton	Eastbound exit and westbound entrance
		4	SH 1/Twin Coast Discovery Hwy North Northern Motorway North Shore, Whangarei	Eastbound exit and westbound entrance SH 16/Twin Coast Discovery Highway concurrency begins
Waitakere City	Westgate	19	SH 18 Hobsonville Road North Shore	Northwestern Motorway ends
Rodney District	Wellsford	108	SH 1/Twin Coast Discovery Hwy North Whangarei, Kaitaia	SH 16 ends
Rodney District	Wellsford	108	SH 1/Thermal Explorer Highway South Warkworth, Auckland	SH 16 ends

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v t e New Zealand state highways
List of New Zealand state highways List of unused highways in New Zealand List of motorways and expressways in New Zealand
National	SH 1 (incl. SH 1B, SH 1D) SH 2 (incl. SH 2B) SH 3 (incl. SH 3A) SH 4 SH 5 SH 6 (incl. SH 6A) SH 7 (incl. SH 7A) SH 8 (incl. SH 8A, SH 8B)
North Island	SH 10 SH 11 SH 12 SH 14 SH 15A SH 16 SH 18 SH 20 (incl. SH 20A, SH 20B) SH 21 SH 22 SH 23 SH 24 SH 25 (incl. SH 25A) SH 26 SH 27 SH 28 SH 29 (incl. SH 29A) SH 30 (incl. SH 30A) SH 31 SH 32 SH 33 SH 34 SH 35 SH 36 SH 37 SH 38 SH 39 SH 41 SH 43 SH 44 SH 45 SH 46 SH 47 SH 48 SH 49 SH 50 (incl. SH 50A) SH 53 SH 54 SH 56 SH 57 SH 58
South Island	SH 60 SH 62 SH 63 SH 65 SH 67 (incl. SH 67A) SH 69 SH 71 SH 73 SH 74 (incl. SH 74A) SH 75 SH 76 SH 77 SH 78 SH 79 SH 80 SH 82 SH 83 SH 84 SH 85 SH 86 SH 87 SH 88 SH 90 SH 93 SH 94 SH 95 SH 96 SH 97 SH 98 SH 99
Former state highways	SH 1A SH 2A SH 15 SH 17 SH 36 SH 40 SH 47A SH 49A SH 52 SH 57A SH 61 SH 70 SH 72 SH 73A SH 89 SH 91 SH 92
Touring routes	Twin Coast Discovery Highway Thermal Explorer Highway Pacific Coast Highway Classic New Zealand Wine Trail Alpine Pacific Triangle Great Alpine Highway Foothills Scenic Route Southern Scenic Route