State Highway 18 (New Zealand)

State Highway 18
State Highway 18
Route information
	Maintained by NZ Transport Agency
Length	14 km (8.7 mi)
Major junctions
North-east end	SH 1 (Auckland Northern Motorway) at North Shore
South-west end	SH 16 south (Northwestern Motorway) at West Harbour
Location
Country	New Zealand
Primary; destinations	Greenhithe, Hobsonville
Highway system
	New Zealand state highways; Motorways and expressways; List;

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 West 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 and runs southwest as a dual carriageway road, and is coextensive with the Upper Harbour Highway, which after two kilometres becomes 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 Waitematā 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.

Interchanges

Territorial authority	Location	km	mi	Exit	Destinations	Notes
Auckland – Upper Harbour Local Board	Unsworth Heights	0.0	0.0		SH 1 south (Northern Motorway) – Auckland	SH 18 begins
					SH 1 north (Northern Motorway) – Whangarei
		0.5	0.31	1	Caribbean Drive Paul Matthews Road	Eastbound exit and westbound entrance
		2.4	1.5	2	Albany Highway (Urban Route 26)	Upper Harbour Motorway begins
	Greenhithe	4.3	2.7	4	Greenhithe Road	Westbound exit and eastbound entrance
		6.2	3.9	6	Tauhinu Road	Eastbound exit and Westbound entrance
		7.4	4.6	Upper Harbour Bridge (Waitematā Harbour)
	Hobsonville	8.8	5.5	8	Squadron Drive	Westbound exit and eastbound entrance
		10.7	6.6	9	Brigham Creek Road – Whenuapai, Wellsford	to SH 16 north
		12.7	7.9	10	Trig Road	Westbound exit and eastbound entrance
Auckland – Henderson-Massey Local Board	Westgate	13.9	8.6	11	Hobsonville Road (Urban Route 32)	Westbound exit and eastbound entrance
Auckland – Henderson-Massey Local Board	Westgate	14.0	8.7		SH 16 south (Northwestern Motorway) – 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

^ ^a ^b "Pedestrians to hit new motorway". Auckland Now. 3 August 2011. Retrieved 27 September 2011.

External links

New Zealand Transport Agency

[TOHIT-1] "Pedestrians to hit new motorway". Auckland Now. 3 August 2011. Retrieved 27 September 2011.

[1]

v t e New Zealand state highways
List of New Zealand state highways List of motorways and expressways in New Zealand
National	SH 1 (incl. SH 1B, SH 1C) SH 2 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 15 SH 16 SH 18 SH 19 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 SH 51 SH 53 SH 54 SH 56 SH 57 SH 58 SH 59
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 1F SH 2A SH 2B SH 15 SH 15A SH 17 SH 36 SH 40 SH 47A SH 49A SH 50A 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 Inland Scenic Route Central Otago Touring Route Southern Scenic Route

v t e Streets, Roads, Motorways and Highways in Auckland
Auckland urban route network Motorways in Auckland
Auckland city centre streets	Anzac Avenue Customs Street Hobson Street Karangahape Road Khyber Pass Road Quay Street Queen Street Shortland Street The Strand Symonds Street Victoria Street Wellesley Street
Arterial roads	Dominion Road Great North Road Great South Road New North Road Tamaki Drive
Suburban and regional roads	Kiwi Esplanade Portage Road, Ōtāhuhu Scenic Drive
Motorways and State Highways	Northern Motorway Northwestern Motorway Southwestern Motorway Southern Motorway State Highway 16 State Highway 22 Twin Coast Discovery Highway Upper Harbour Motorway O Mahurangi Penlink