State Highway 18 (New Zealand)

Upper Harbour Motorway
Upper Harbour Motorway
Location	Cuthill, Albany Highway Interchange –; Hobsonville, Buckley Ave
Length	6 km (3.7 mi)
Existed	2007–present

State Highway 18
State Highway 18
Route information
	Maintained by NZ Transport Agency
Length	14 km (8.7 mi)
Major junctions
From	SH 1 Northern Motorway, Meadowood, North Shore City
To	SH 16 Northwest Motorway, West Harbour, Waitakere City
Location
Country	New Zealand
Major cities	Greenhithe, Hobsonville
Highway system
	New Zealand state highways; Motorways and expressways; List;

State Highway 18 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

As of 2008, State Highway 18 begins at the Northern Motorway as a dual carriageway road. Heading west 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 over the Upper Harbour Bridge. The motorway ends at Buckley Avenue, 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 Northwestern 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	Squadron Drive	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
	Westgate		Hobsonville Road Hobsonville	Opens 2012 Westbound exit and eastbound entrance
From 2012, terminates onto SH 16 Northwest Motorway southbound at Westgate

v t e New Zealand state highways
List of New Zealand state highways List of motorways and expressways in New Zealand
National	SH 1 (incl. SH 1B, SH 1C) SH 2 SH 3 (incl. SH 3A) SH 4 SH 5 SH 6 (incl. SH 6A) SH 7 (incl. SH 7A) SH 8 (incl. SH 8A, SH 8B)
North Island	SH 10 SH 11 SH 12 SH 14 SH 15 SH 16 SH 18 SH 20 (incl. SH 20A, SH 20B) SH 21 SH 22 SH 23 SH 24 SH 25 (incl. SH 25A) SH 26 SH 27 SH 28 SH 29 (incl. SH 29A) SH 30 (incl. SH 30A) SH 31 SH 32 SH 33 SH 34 SH 35 SH 36 SH 37 SH 38 SH 39 SH 41 SH 43 SH 44 SH 45 SH 46 SH 47 SH 48 SH 49 SH 50 SH 51 SH 53 SH 54 SH 56 SH 57 SH 58 SH 59
South Island	SH 60 SH 62 SH 63 SH 65 SH 67 (incl. SH 67A) SH 69 SH 71 SH 73 SH 74 (incl. SH 74A) SH 75 SH 76 SH 77 SH 78 SH 79 SH 80 SH 82 SH 83 SH 84 SH 85 SH 86 SH 87 SH 88 SH 90 SH 93 SH 94 SH 95 SH 96 SH 97 SH 98 SH 99
Former state highways	SH 1A SH 1F SH 2A SH 2B SH 15 SH 15A SH 17 SH 36 SH 40 SH 47A SH 49A SH 50A SH 52 SH 57A SH 61 SH 70 SH 72 SH 73A SH 89 SH 91 SH 92
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 Inland Scenic Route Central Otago Touring Route Southern Scenic Route

Route

Upper Harbour Motorway

Interchanges

See also