New Zealand State Highway 18
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 (also known as the Upper Harbour Motorway) is a State Highway linking North Shore City and Waitakere City in Auckland, New Zealand. It is the northern part of the Western Ring Route. State Highway 18 formerly ran along the Coatesville Riverhead Highway, further north than its current position.
Route
State Highway 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.
Interchanges
Territorial authority |
Location |
km |
# |
Destinations |
Notes |
Auckland - Upper Harbour Board |
|
0.0 |
|
SH 1 Northern Motorway (south) – Auckland |
SH 18 ends |
|
|
|
SH 1 Northern Motorway (north) – Whangarei |
|
|
|
|
Caribbean Drive |
|
|
|
Paul Matthews Drive |
|
|
|
Unsworth Drive |
Westbound exit only |
|
2.4 |
2 |
Route 26 Albany Highway |
Motorway ends |
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 Board |
Westgate |
|
11 |
Route 32 Hobsonville Road |
Westbound exit and eastbound entrance |
|
|
SH 16 Northwest Motorway (south) – Waitakere, Auckland |
SH 18 ends |
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
|
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
- List of New Zealand State Highways
References
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| North Island | |
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| South Island | |
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| Former state highways | |
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| 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
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| Auckland | |
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| Wellington | |
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| Rest of North Island | |
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| South Island | |
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| Past motorways/expressways | |
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| Future motorways/expressways | |
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| Major infrastructure | |
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