State Highway 18 (New Zealand)

State Highway 18 is a New Zealand State Highway linking North Shore City and Waitakere City.

Formerly, State Highway 18 was further north tha its current position. This route is now the Coatesville Riverhead Highway.

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.

Upper Harbour Motorway

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).

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 on opening of extension west in 2012.
Terminates onto Hobsonville Road at Buckley Avenue

See also

• List of New Zealand State Highways