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{{short description|Road in New Zealand}}
{{New Zealand State Highway infobox
{{Use dmy dates|date=June 2015}}
| shield-image-file=
{{Use New Zealand English|date=June 2015}}
| shield-size=
{{infobox road
| state-highway-number=18
|country=NZL
| map-image-file=
|type=SH
| map-size=
|route=18
| length-km=14
|alternate_name=
| length-mi=9
|map= {{maplink|frame=yes|plain=yes|frame-align=center|frame-width=300|frame-height=300|frame-lat=-36.78|frame-long=174.68|zoom=11|type=line}}
| direction=Northeast-Southwest
|map_custom= yes
| start= [[SH 1]] [[Northern Motorway]]<br>[[Meadowood, New Zealand|Meadowood]], [[North Shore City]]
|map_notes=
| destinations= [[Greenhithe]], [[Hobsonville]]
|length_km=14
| end=[[SH 16]] [[Northwest Motorway]]<br>[[West Harbour]], [[Waitakere City]]
|direction_a=North-east
| single-percent=43
|terminus_a= {{jct|country=NZL|SH|1|name1=[[Auckland Northern Motorway]]}} at [[North Shore City|North Shore]]
| dual-percent=14
|destinations= [[Greenhithe, New Zealand|Greenhithe]], [[Hobsonville]]
| mway-percent=43
|direction_b=South-west
| tourist-routes= ''None''
|terminus_b= {{jct|country=NZL|SH|16|dir1=south|name1=[[Northwestern Motorway]]}} at [[West Harbour, Auckland|West Harbour]]
|previous_type=SH
|previous_route=17
|next_type=SH
|next_route=20
}}
}}
[[File:Hobsonville, Rural Scenes Giving Way.jpg|thumb|right|As of early 2010, large parts of State Highway 18 remain a standard, mostly rural highway.]]


[[File:Hobsonville, Rural Scenes Giving Way.jpg|thumb|right|The former route of State Highway 18, in 2010, was a mostly rural highway. This route is now designated Urban route 32.]]
'''State Highway 18''' is a [[New Zealand State Highway network|State Highway]] linking [[North Shore City]] and [[Waitakere City]] in [[Auckland]], [[New Zealand]]. State Highway 18 formerly ran along the Coatesville Riverhead Highway, further north than its current position.
[[File:Upper Harbour Motorway at Trig Road Interchange.jpg|thumb|The Hobsonville section of the Upper Harbour Motorway, looking west from the Trig Road Interchange]]

'''State Highway 18''' ('''SH 18''') is a [[New Zealand state highway network|state highway]] that runs between the [[Auckland Northern Motorway]] (SH 1) on the [[North Shore, New Zealand|North Shore]] and the [[Northwestern Motorway]] (SH 16) in [[West Auckland, New Zealand|West 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]].


==Route==
==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 [[New Zealand State Highway 16|State Highway 16]] at the end of the [[Northwestern Motorway]].
SH 18 begins at the [[Auckland Northern Motorway]] and runs southwest as a dual carriageway road, and is coextensive with the Upper Harbour Highway, which after two kilometres 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 [[Waitematā 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.<ref name=TOHIT>{{cite news|title=Pedestrians to hit new motorway|url=http://www.stuff.co.nz/auckland/5378186/Pedestrians-to-hit-new-motorway|access-date=27 September 2011|newspaper=Auckland Now|date=3 August 2011}}</ref> This road cuts across in a southwestern direction across farmland to Westgate, where it turns southward and merges with the [[Northwestern Motorway]] ({{NZSH|16}}) southbound.


==Interchanges==
==Upper Harbour Motorway==
{{Jcttop |exit |unit=km |state_col=[[Territorial authority]] |nocty=yes}}
{{New Zealand motorway
{{Jctint|exit
| motorway= Upper Harbour Motorway
|county_special=[[Auckland Council|Auckland]] – Upper Harbour Local Board
| image-file=
|cspan=10
| image-size= 250px
|location_special= [[Unsworth Heights]]
| image-caption=
|lspan=4
| state-highway= State Highway 18
| length-km= 6
|km=0.0
|exit=
| length-mi= 4
|road={{jct|country=NZL|SH|1|name1=[[Auckland Northern Motorway|Northern Motorway]]|dir1=south}} – Auckland
| direction= Northeast - Southwest
|notes=''SH 18 begins''
| start= [[Cuthill]] <br> Albany Highway Interchange
| destinations= [[Greenhithe]]
| end= [[Hobsonville]] <br> Buckley Ave
| opening-date= 2007
| completion-date=
| junctions= ''None''
}}
}}
{{Jctint|exit
|road={{jct|country=NZL|SH|1|name1=Northern Motorway|dir1=north}} – Whangarei
}}
{{Jctint|exit
|km=0.5
|road=Caribbean Drive<br>Paul Matthews Road
|exit=1
|notes=Eastbound exit and westbound entrance
}}
{{Jctint|exit
|km=2.4
|exit=2
|road=Albany Highway (Urban Route 26)
|notes=''Upper Harbour Motorway begins''
}}
{{Jctint|exit
|location_special= [[Greenhithe, New Zealand|Greenhithe]]
|lspan=3
|km=4.3
|exit=4
|road=Greenhithe Road
|notes=Westbound exit and eastbound entrance
}}
{{Jctint|exit
|km=6.2
|exit=6
|road=Tauhinu Road
|notes=Eastbound exit and Westbound entrance
}}
{{jctbridge|exit
|km=7.4
|place=[[Upper Harbour Bridge]] ([[Waitematā Harbour]])
}}
{{Jctint|exit
|location_special= [[Hobsonville]]
|lspan=3
|km=8.8
|exit=8
|road=Squadron Drive
|notes=Westbound exit and eastbound entrance
}}
{{Jctint|exit
|km=10.7
|exit=9
|road=Brigham Creek Road – Whenuapai, Wellsford
|notes=to {{jct|country=NZL|SH|16|dir1=north}}
}}
{{Jctint|exit
|km=12.7
|exit=10
|road=Trig Road
|notes=Westbound exit and eastbound entrance
}}
{{Jctint|exit
|county_special=[[Auckland Council|Auckland]] – Henderson-Massey Local Board
|cspan=2
|location_special=[[Westgate, Auckland|Westgate]]
|lspan=2
|km=13.9
|exit=11
|road=Hobsonville Road (Urban Route 32)
|notes=Westbound exit and eastbound entrance
}}
{{Jctint|exit
|km=14.0
|exit=
|road={{jct|country=NZL|SH|16|name1=[[Northwestern Motorway]]|dir1=south}} – Waitakere, Auckland''
|notes=''SH 18 ends''<br>''Upper Harbour Motorway ends''
}}
{{jctbtm|keys=|conv=yes|col=7}}


==Former route==
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.
SH 18 formerly ran along the Coatesville Riverhead Highway, further north than its current position. This route is now designated as [[Auckland urban route network|Auckland Urban Route]] 28.


== Cycleway ==
The Upper Harbour Motorway is currently six kilometres long with four junctions (including termini).
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.<ref name=TOHIT/>

===Interchanges===
{| class="wikitable"
|-
! [[Territorial authority]]
! Location
! [[Exit number|Exit]]
! Destinations
! Notes
|-
| colspan=5 align=center| ''Terminates onto Upper Harbour Highway at Albany Highway interchange''
|-
| rowspan=3|North Shore City
|
| 2
| Albany Highway
|
|-
|
| 4
| Greenhithe Road
| Eastbound exit and westbound entrance
|-
|
| 6
| Tauhinu Road
| Westbound exit and eastbound entrance
|-
| colspan=5 align=center| ''[[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.
|-
| colspan=5 align=center| ''Currently terminates onto Hobsonville Road at Buckley Avenue''
|-style="background:#FFFFAA;"
|rowspan=3|Waitakere City
|
|
| Brigham Creek Road
| Opens 2012
|-style="background:#FFFFAA;"
|
|
| Trig Road
| Opens 2012<br>Westbound exit and eastbound entrance
|-style="background:#FFFFAA;"
| Westgate
|
| Hobsonville Road<br>[[Hobsonville]]
| Opens 2012 <br> Westbound exit and eastbound entrance
|-style="background:#FFFFAA;"
|colspan=5 align=center| ''From 2012, terminates onto [[New Zealand State Highway 16|SH 16]] [[Northwest Motorway]] southbound at Westgate''
|}


==See also==
==See also==
*[[List of New Zealand state highways]]

==References==
{{Reflist}}


==External links==
*[[List of New Zealand State Highways]]
* [http://www.nzta.govt.nz New Zealand Transport Agency]


{{New Zealand State Highway navbox}}
{{New Zealand State Highway navbox}}
{{New Zealand motorway list}}
{{New Zealand motorway list}}
{{Streets in Auckland}}


[[Category:Roads in New Zealand|State Highway 18]]
[[Category:State Highways in New Zealand|18]]
[[Category:Transport in the Auckland Region]]

Latest revision as of 01:08, 13 November 2023

State Highway 18 shield}}
State Highway 18
Map
Route information
Maintained by NZ Transport Agency
Length14 km (8.7 mi)
Major junctions
North-east end SH 1 (Auckland Northern Motorway) at North Shore
South-west end SH 16 south (Northwestern Motorway) at West Harbour
Location
CountryNew Zealand
Primary
destinations		Greenhithe, Hobsonville
Highway system
← SH 17→ SH 20
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 (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 West 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.

Route[edit]

SH 18 begins at the Auckland Northern Motorway and runs southwest as a dual carriageway road, and is coextensive with the Upper Harbour Highway, which after two kilometres 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 Waitematā 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[edit]

Territorial authorityLocationkmmiExitDestinationsNotes
Auckland – Upper Harbour Local BoardUnsworth Heights0.00.0 SH 1 south (Northern Motorway) – AucklandSH 18 begins
SH 1 north (Northern Motorway) – Whangarei
0.50.311Caribbean Drive
Paul Matthews Road		Eastbound exit and westbound entrance
2.41.52Albany Highway (Urban Route 26)Upper Harbour Motorway begins
Greenhithe4.32.74Greenhithe RoadWestbound exit and eastbound entrance
6.23.96Tauhinu RoadEastbound exit and Westbound entrance
7.44.6Upper Harbour Bridge (Waitematā Harbour)
Hobsonville8.85.58Squadron DriveWestbound exit and eastbound entrance
10.76.69Brigham Creek Road – Whenuapai, Wellsfordto SH 16 north
12.77.910Trig RoadWestbound exit and eastbound entrance
Auckland – Henderson-Massey Local BoardWestgate13.98.611Hobsonville Road (Urban Route 32)Westbound exit and eastbound entrance
14.08.7 SH 16 south (Northwestern Motorway) – Waitakere, AucklandSH 18 ends
Upper Harbour Motorway ends
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Former route[edit]

SH 18 formerly ran along the Coatesville Riverhead Highway, further north than its current position. This route is now designated as Auckland Urban Route 28.

Cycleway[edit]

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[edit]

References[edit]

  1. ^ a b "Pedestrians to hit new motorway". Auckland Now. 3 August 2011. Retrieved 27 September 2011.

External links[edit]

Retrieved from "https://en.wikipedia.org/w/index.php?title=State_Highway_18_(New_Zealand)&oldid=1184852008"