New Zealand State Highway 18
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| Route information | ||||
| Maintained by NZ Transport Agency | ||||
| Length: | 14 km (9 mi) | |||
| Major junctions | ||||
| North-east end: |
 SH 1 Northern Motorway, Meadowood, North Shore
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| South-west end: |
 SH 16 Northwestern Motorway, West Harbour, Waitakere
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| Location | ||||
| Primary destinations: |
Greenhithe, Hobsonville | |||
| Highway system | ||||
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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.
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. 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 or Trig Road exits.
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