New Zealand State Highway 18
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| State Highway 18 | |
| Length | 14 km 9 mi |
| Primary direction | Northeast-Southwest |
| Start | SH 1 Northern Motorway Meadowood, North Shore City |
| Primary destinations | Greenhithe, Hobsonville |
| End | SH 16 Northwest Motorway West Harbour, Waitakere City |
| Route quality | 43% single carriageway 14% dual carriageway 43% motorway |
| Tourist routes | None |
State Highway 18 is a New Zealand State Highway linking North Shore City and Waitakere City.
Formerly, State Highway 18 was further north than its current position. This route is now the Coatesville Riverhead Highway.
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[edit] Route
As of 2008, this is the route State Highway 18 follows.
State Highway 18 begins at the Northern Motorway as a dual carriageway road. Heading east on Upper Harbour Highway, after two kilometres, it 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 Waitemata Harbour via the Upper Harbour Bridge. At Buckley Avenue, the motorway ends, and State Highway 18 follows the single carriageway Hobsonville Road. State Highway 18 runs north of the suburb of Hobsonville, before meeting State Highway 16 at the end of the Northwest Motorway.
[edit] Upper Harbour Motorway
| Upper Harbour Motorway | |
| State Highway Number | State Highway 18 |
| Length | 6 km 4 miles |
| Direction | Northeast - Southwest |
| Start | Cuthill Albany Highway Interchange |
| Primary destinations | Greenhithe |
| End | Hobsonville Buckley Ave |
| Construction dates | 2007 - |
| State Highways joined | None |
The Upper Harbour Motorway is the name of the motorway section of State Highway 18. The first section opened in December 2007, and the second section, west of the first section, will open in 2012.
The Upper Harbour Motorway is currently six kilometres long with four junctions (including termini).
[edit] Interchanges
| Territorial authority | Location | Exit | Destinations | Notes |
|---|---|---|---|---|
| Terminates onto Upper Harbour Highway at Albany Highway interchange | ||||
| North Shore City | 2 | Albany Highway | ||
| 4 | Greenhithe Road | Eastbound exit and westbound entrance | ||
| 6 | Tauhinu Road | Westbound exit and eastbound entrance | ||
| Upper Harbour Bridge | ||||
| Waitakere City | 8 | Buckley Avenue | Currently at-grade. Will be upgraded to grade-separated interchage (westbound exit and eastbound entrance) on opening of extension west in 2012. | |
| Currently terminates onto Hobsonville Road at Buckley Avenue | ||||
| Waitakere City | Brigham Creek Road | Opens 2012 | ||
| Trig Road | Opens 2012 Westbound exit and eastbound entrance |
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| Westgate | Hobsonville Road Hobsonville |
Opens 2012 Westbound exit and eastbound entrance |
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| From 2012, terminates onto SH 16 Northwest Motorway soutbound at Westgate | ||||
[edit] See also
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