New Zealand State Highway 18

State Highway 18

Route information

Maintained by New Zealand Transport Agency

Length:

14 km (9 mi)

Major junctions

North-east end:

SH 1 Northern Motorway, Meadowood, North Shore

South-west end:

SH 16 Northwestern Motorway, West Harbour, Waitakere

Location

Primary
destinations:

Greenhithe, Hobsonville

Highway system

New Zealand state highways

←

SH 17

SH 20

→

The former route of State Highway 18, in 2010, was a mostly rural highway. This route is now designated Urban route 32.

The Hobsonville section of the Upper Harbour Motorway, looking west from the Trig Road Interchange

State Highway 18 (SH 18) is a state highway that runs between the Auckland Northern Motorway (SH 1) on the North Shore and the Northwestern Motorway (SH 16) in Waitakere in Auckland, New Zealand. The Upper Harbour Motorway forms most of its length as of 2016 (the exception being a two-kilometre stretch at the north-eastern end). SH 18 forms the northern part of the Western Ring Route, which continues from Waitakere south-east to Manukau.

Route

SH 18 begins at the Auckland Northern Motorway, as a dual carriageway road, heading west on Upper Harbour Highway, after two kilometres becoming a motorway at the Albany Highway interchange. This four-lane section of motorway opened in December 2007, and bypassed the single carriageway Upper Harbour Drive. The motorway heads south-west, crossing the upper reaches of the Waitemata Harbour over the Upper Harbour Bridge. At Squadron Drive, the highway extends onto a new section of motorway, which opened in August 2011, bypassing Hobsonville Road.^[1] This road cuts across in a southwestern direction across farmland to Westgate, where it turns southward and merges with the Northwestern Motorway (SH 16) southbound. Motorists wishing to travel north onto SH 16 can cut across by taking the Brigham Creek Road exit.

Interchanges

Territorial authority	Location	km	#	Destinations	Notes
Auckland – Upper Harbour Local Board	Unsworth Heights	0.0		SH 1 Northern Motorway (south) – Auckland	SH 18 begins.
	Unsworth Heights	0.0		SH 1 Northern Motorway (north) – Whangarei	SH 18 begins.
				Caribbean Drive
				Paul Matthews Drive
				Unsworth Drive	Westbound exit only
		2.4	2	Route 26 Albany Highway	Upper Harbour Motorway begins.
	Greenhithe	4.3	4	Greenhithe Road	Eastbound exit and westbound entrance
		6.2	6	Tauhinu Road	Westbound exit and eastbound entrance
		7.4		Upper Harbour Bridge over Waitemata Harbour
	Hobsonville		8	Squadron Drive	Westbound exit and eastbound entrance
			9	Brigham Creek Road – Whenuapai, Helensville	to north
			10	Trig Road	Westbound exit and eastbound entrance
Auckland – Henderson-Massey Local Board	Westgate		11	Route 32 Hobsonville Road	Westbound exit and eastbound entrance
Auckland – Henderson-Massey Local Board	Westgate		11	SH 16 Northwestern Motorway (south) – Waitakere, Auckland	SH 18 ends. Upper Harbour Motorway ends.
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Former route

SH 18 formerly ran along the Coatesville Riverhead Highway, further north than its current position. This route is now designated as Auckland Urban Route 28.

Cycleway

The route of the new motorway from Upper Harbour Bridge to Westgate was originally to receive a cycleway as well, but although the land was set aside, there is no timetable for the construction of the route.^[1]

References

1 2 "Pedestrians to hit new motorway". Auckland Now. 3 August 2011. Retrieved 27 September 2011.

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

List of motorways and expressways in New Zealand

Auckland	Northern Motorway Northwestern Motorway Southern Motorway Southwestern Motorway Upper Harbour Motorway

Wellington	Johnsonville–Porirua Motorway Wellington Urban Motorway Hutt Expressway

Rest of North Island	Waikato Expressway Takitimu Drive Tauranga Eastern Link Hawke's Bay Expressway

South Island	Christchurch Northern Motorway Christchurch Southern Motorway Christchurch-Lyttelton Motorway Dunedin Southern Motorway

Past motorways/expressways	New Plymouth Southern Motorway Wanganui Metropolitan Motorway Dunedin Northern Motorway

Future motorways/expressways	Puhoi to Wellsford Motorway Penlink Second Harbour Crossing Waterview Connection Transmission Gully Motorway Kapiti Expressway Western Belfast Bypass

Major infrastructure	Upper Harbour Bridge Northern Busway, Auckland Auckland Harbour Bridge Victoria Park Tunnel and Viaduct Central Motorway Junction Newmarket Viaduct Mangere Bridge Tauranga Harbour Bridge Ngauranga Interchange Terrace Motorway Tunnel Lyttelton Road Tunnel

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