State Highway 18 shield}}
State Highway 18
Route information
Maintained by NZ Transport Agency
Length14 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
CountryNew Zealand
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

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 authorityLocationkmmiExitDestinationsNotes
Auckland – Upper Harbour Local BoardUnsworth Heights0.00.0 SH 1 south (Northern Motorway) – AucklandSH 18 begins
SH 1 north (Northern Motorway) – Whangarei
0.50.311Caribbean Drive
Paul Matthews Road		Eastbound exit and westbound entrance
2.41.52Albany Highway (Urban Route 26)Upper Harbour Motorway begins
Greenhithe4.32.74Greenhithe RoadWestbound exit and eastbound entrance
6.23.96Tauhinu RoadEastbound exit and Westbound entrance
7.44.6Upper Harbour Bridge (Waitematā Harbour)
Hobsonville8.85.58Squadron DriveWestbound exit and eastbound entrance
10.76.69Brigham Creek Road – Whenuapai, Wellsfordto SH 16 north
12.77.910Trig RoadWestbound exit and eastbound entrance
Auckland – Henderson-Massey Local BoardWestgate13.98.611Hobsonville Road (Urban Route 32)Westbound exit and eastbound entrance
14.08.7 SH 16 south (Northwestern Motorway) – Waitakere, AucklandSH 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. 1 2 "Pedestrians to hit new motorway". Auckland Now. 3 August 2011. Retrieved 27 September 2011.
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