- New Zealand State Highway 20
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State Highway 20
Southwestern Motorway Route information Maintained by New Zealand Transport Agency Length: 19 km (12 mi) Existed: 1977 – present Major junctions South end: 
SH 1 Southern Motorway at Manukau City CentreSH 20B at Puhinui
SH 20A at MangereNorth end: Sandringham Road/Maioro Street at Mount Roskill Highway system New Zealand State Highways
Motorways and Expressways • List • Unused← 
SH 18SH 21 
→
Aerial view of the interchange between SH20 (diagonal from bottom left to upper right) and SH20A towards the airport (towards bottom right).
State Highway 20, also known as either the Southwestern Motorway, or the Mangere Motorway, is a New Zealand State Highway linking State Highway 1 at Manukau City Centre with Mount Roskill, via Mangere and Onehunga. Along with its spurs, State Highway 20A and 20B, the state highway serves Auckland Airport, the country's largest, therefore making State Highway 20 a key arterial route connecting the airport to the wider Auckland region and most of the upper North Island. The route also forms the southern part of the future Western Ring Route, a 48 km motorway route bypassing central Auckland.
On the opening of the northbound lanes between SH 1 at Manukau and SH 20B at Puhinui in September 2010, State Highway 20 will become New Zealand's first fully motorway-standard state highway. Currently, northbound traffic between these two points uses local roads.
Contents
Route and status
SH20 stretches from the Auckland Southern Motorway / New Zealand State Highway 1 in Manukau City to Sandringham Road, Sandringham, in Auckland City - however, currently (mid 2010) only the section between Puhinui Road in the southeast and Sandringham Road in the northwest is of motorway standard. The motorway extension from Queenstown Rd in Mt Roskill to Sandringham Road opened on 15 May 2009.[1]
A large-scale new interchange and 4.5 km length motorway-standard section from SH1 to Puhini Road is being built, and is to be joined by the end of 2010, after a start of works in 2006. The interchange and motorway section includes a total of 12 bridge structures, and is expected to cost approximately $210 million.[2]
The Motorway crosses Manukau Harbour at Mangere Bridge. The bridge duplication, with future provision for rail, was opened 7 months ahead of schedule on 25 July 2010, for a construction cost of $230 million.[2]
The planned final terminus will be the Northwest Motorway / New Zealand State Highway 16 via the Waterview Connection scheduled to open by the middle of the 2010s.
- Airport connection
The Southwestern Motorway bypasses Auckland International Airport, with SH20A from the north and SH20B from the east both branching off the SH20 to the airport.
SH20B leaves SH20 at the southern terminus of the Southwestern Motorway and travels west along Puhinui Road to the airport. SH20A leaves the Southwestern Motorway in Mangere and travels south along an additional stretch of motorway, commonly referred to as the "Airport Motorway". The motorway terminates at Kirkbride Road, and traffic continues on SH20A south to the airport.
SH20, SH20A, and SH20B form an almost triangular shape between the southern terminus of the Southwestern Motorway, Auckland International Airport, and the SH20/SH20A motorway junction.
Future upgrades
In the 2010s, the Waterview Connection is to connect the current (2011) western end of the motorway from Hillsborough through to New Zealand State Highway 16 at Point Chevalier.
Proposals to upgrade State Highway 20A as part of a general route upgrade to the airport have been floated in a number of studies.
Exit List
Territorial authority Location km Exit Destinations Notes Current New (from 1 Nov 2010)[3] Manukau City Auckland — Otara-Papatoetoe/Manurewa Boards Manukau CBD 0.0 SH 1 Southern Motorway south — Hamilton, TaurangaSH 20 and Southwest Motorway end 1 SH 1 Southern Motorway north — Auckland2 Lambie Drive — Manukau City Centre Puhinui 3 Route 30 Cavendish Drive No southbound exit (use Puhinui Road)
Northbound entrance and connection to SH 20B and
Auckland — Otara-Papatoetoe Board Puhinui 3 SH 20B Puhinui Road — AirportNo northbound exit (use Cavendish Drive)
Southbound entrance and connection to SH 20B andAuckland — Mangere-Otahuhu Board Mangere 7 Route 14 Massey Road 9 SH 20A — AirportNo southbound entrance (use SH20B or Massey Road)
Carriageway mainline connects north to west, traffic proceeding from/to south on motorway must 'exit'.10 Walmsley Road Southbound Coronation Road Northbound Mangere Bridge 12 Mahunga Drive — Mangere Bridge Township, Favona Southbound exit and northbound entrance Mangere Bridge over Manukau Harbour Auckland City Auckland — Maungakiekie-Tāmaki Board Onehunga 13 Neilson Street — Onehunga Wharf, Onehunga, Penrose, Mt Wellington Auckland — Maungakiekie-Tāmaki/Puketapapa Boards Hillsborough 15 Route 12 Queenstown Road — Auckland City Centre Northbound exit and southbound entrance Auckland — Puketapapa Board 16 Route 15 Hillsborough Road Mount Roskill 18 Route 4 Dominion Road Sandringham Road/Maioro Street SH 20 and Southwest Motorway end 1.000 mi = 1.609 km; 1.000 km = 0.621 mi
Concurrency terminus • Closed/Former • Incomplete access • UnopenedSee also
References
- ^ Dearnaley, Mathew (18 May 2009). "Another piece slots into city's commuter jigsaw". The New Zealand Herald. http://www.nzherald.co.nz/nz/news/article.cfm?c_id=1&objectid=10572916&pnum=0. Retrieved 5 March 2010.
- ^ a b "Western ring route progressing". The New Zealand Herald. 7 June 2010. http://www.nzherald.co.nz/roads/news/article.cfm?c_id=309&objectid=10650212. Retrieved 9 July 2010.
- ^ "Auckland Governance Arrangements: Maps relating to Determinations of Wards, Local Boards and Boundaries for Auckland". Local Government Commission. March 2010. http://www.lgc.govt.nz/lgcwebsite.nsf/Files/AKGMarch10Vol2/$file/AucklandGovernanceArrangementsVolume2.pdf. Retrieved 2010-07-10.
External links
- "Mangere Bridge Opened Today". The New Zealand Herald. 25 July 2010. Retrieved 1 August 2010.
New Zealand highways New Zealand State Highway network · List of New Zealand State Highways National 
North Island SH 10 · SH 11 · SH 12 · SH 14 · SH 15A · SH 16 · SH 17 · SH 18 · SH 20 · SH 21 · SH 22 · SH 23 · SH 24 · SH 25 (incl. SH 25A) · SH 26 · SH 27 · SH 28 · SH 29 · 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 (incl. SH 50A) · SH 53 · SH 54 · SH 56 · SH 57 · SH 58South Island 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 · Southern Scenic RouteList of motorways and expressways in New Zealand Auckland Northern Motorway · Northwestern Motorway · Southern Motorway · Southwestern Motorway · Upper Harbour MotorwayWellington Rest of North Island South Island Past motorways/expressways Wanganui Metropolitan Motorway · Dunedin Northern MotorwayFuture motorways/expressways Penlink · Waterview Connection · Transmission Gully Motorway · Kapiti Expressway · Tauranga Eastern Motorway · Christchurch Southern MotorwayMajor infrastructure Categories:- State highways in New Zealand
- Motorways in New Zealand
- Transport in Auckland
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