State Highway 18 (New Zealand)

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.

State Highway 18
Route information
Maintained by NZ Transport Agency
Length14 km (9 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
Primary
destinations		Greenhithe, Hobsonville
Highway system
← 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

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 # Destinations Notes
Auckland – Upper Harbour Local Board Unsworth Heights 0.0 SH 1 south (Northern Motorway) – Auckland SH 18 begins.
SH 1 north (Northern Motorway) – Whangarei
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 Waitematā 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
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]

See also

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