New Zealand State Highway 18

Last updated

State Highway 18 NZ.svg

State Highway 18
Route information
Maintained by NZ Transport Agency
Length14 km (9 mi)
Major junctions
North-east endState Highway 1 NZ.svg SH 1 Northern Motorway, Meadowwood, North Shore
South-west endState Highway 16 NZ.svg SH 16 Northwestern Motorway, West Harbour, Waitakere
Location
Primary
destinations
Greenhithe, Hobsonville
Highway system
State Highway 17 NZ.svg SH 17 SH 20 State Highway 20 NZ.svg
The former route of State Highway 18, in 2010, was a mostly rural highway. This route is now designated Urban route 32. Hobsonville, Rural Scenes Giving Way.jpg
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 Upper Harbour Motorway at Trig Road Interchange.jpg
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 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.

The New Zealand state highway network is the major national highway network in New Zealand. Nearly 100 roads in the North and South Islands are state highways. All state highways are administered by the NZ Transport Agency.

Auckland Northern Motorway road in New Zealand

The Auckland Northern Motorway in the Auckland Region of New Zealand links central Auckland City and Puhoi in the former Rodney District via the Hibiscus Coast and North Shore. It is part of State Highway 1.

Northwestern Motorway road in New Zealand

The Northwestern Motorway, part of State Highway 16 (SH16), is the major western route and secondary northern route out of Auckland in New Zealand. Twenty-one kilometres in length, the motorway runs from Stanley St in Parnell through the Central Motorway Junction, and west through urban Auckland and Waitakere before continuing northwest and terminating outside of Kumeu. Its western terminus is at Brigham Creek Road in Whenuapai. A large part of it forms the middle section of the Western Ring Route.

Contents

Route

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 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. Motorists wishing to travel north onto SH 16 can cut across by taking the Brigham Creek Road or Trig Road exits.

Waitematā Harbour harbour in Auckland

Waitematā Harbour is the main access by sea to Auckland, New Zealand. For this reason it is often referred to as Auckland Harbour, despite the fact that it is one of two harbours adjoining the city. The harbour forms the northern and eastern coasts of the Auckland isthmus and is crossed by the Auckland Harbour Bridge. It is matched on the southern side of the city by the shallower waters of the Manukau Harbour.

Upper Harbour Bridge bridge in New Zealand

The Upper Harbour Bridge is a motorway bridge in west Auckland, New Zealand. It is technically two bridges, spanning an upper reach of the Waitematā Harbour, and connecting Hobsonville and Greenhithe. It is an important connection for State Highway 18, and became even more important as a component of the Western Ring Route when the route was completed on 2 July 2017.

New Zealand State Highway 16 road in New Zealand

State Highway 16 is a New Zealand state highway linking central Auckland with Wellsford, via Auckland's Northwestern Motorway, Helensville and Kaukapakapa. It provides an alternative to State Highway 1 for traffic travelling between Auckland and parts of Northland from Wellsford northwards.

Interchanges

Territorial authority Locationkm # DestinationsNotes
Auckland – Upper Harbour Local BoardUnsworth Heights0.0State Highway 1 NZ.svg SH 1 south (Northern Motorway) – AucklandSH 18 begins.
State Highway 1 NZ.svg SH 1 north (Northern Motorway) – Whangarei
Caribbean Drive
Paul Matthews Drive
Unsworth DriveWestbound exit only
2.42Route 26 Albany HighwayUpper Harbour Motorway begins.
Greenhithe4.34Greenhithe RoadEastbound exit and westbound entrance
6.26Tauhinu RoadWestbound exit and eastbound entrance
7.4 Upper Harbour Bridge over Waitematā Harbour
Hobsonville8Squadron DriveWestbound exit and eastbound entrance
9Brigham Creek Road – Whenuapai, Helensvilleto State Highway 16 NZ.svg north
10Trig RoadWestbound exit and eastbound entrance
Auckland – Henderson-Massey Local BoardWestgate11Route 32 Hobsonville RoadWestbound exit and eastbound entrance
State Highway 16 NZ.svg 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

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.

Auckland urban route network Wikimedia list article

The Auckland urban route network consists of strategic and primary arterial roads across the Auckland Region of New Zealand. Urban routes are signposted with white shields. To avoid conflict with state highway numbering, there are no urban routes numbered 1, 2, 16, 18, 20, or 22.

Cycleway

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

Related Research Articles

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References

  1. 1 2 "Pedestrians to hit new motorway". Auckland Now. 3 August 2011. Retrieved 27 September 2011.