Southwest Motorway
Encyclopedia
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.
/ 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.
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.
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.
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.
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.
|-
! colspan=2| Territorial authority
! rowspan=2| Location
! rowspan=2| km
! rowspan=2| Exit
! rowspan=2| Destinations
! rowspan=2| Notes
|-
! Current
! New (from 1 Nov 2010)
|-
| rowspan="11"| Manukau City
| rowspan=4| Auckland
— Otara
-Papatoetoe
/Manurewa
Boards
| rowspan=3| Manukau CBD
| rowspan=2| 0.0
|
|
SH 1 Southern Motorway
south — Hamilton
, Tauranga
| SH 20 and Southwest Motorway end
|-
| 1
|SH 1 Southern Motorway
north — Auckland
|
|-
|
| 2
| 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 — Airport
| No northbound exit (use Cavendish Drive)
Southbound entrance and connection to SH 20B and
|-
| rowspan=6| Auckland
— Mangere
-Otahuhu
Board
| rowspan=4| Mangere
|
| 7
| Route 14 Massey Road
|
|-
|
| 9
| SH 20A — Airport
| No southbound entrance (use SH20B or Massey Road)
Carriageway mainline connects north to west, traffic proceeding from/to south on motorway must 'exit'.
|-
|
| rowspan=2| 10
| Walmsley Road
| Southbound
|-
|
| Coronation Road
| Northbound
|-
| rowspan=2| Mangere Bridge
|
| 12
| Mahunga Drive — Mangere Bridge Township
, Favona
| Southbound exit and northbound entrance
|-
| rowspan=2|
| rowspan=2|
| rowspan=2| Mangere Bridge
over Manukau Harbour
| rowspan=2|
|-
| rowspan="6"| Auckland City
| rowspan=2| Auckland
— Maungakiekie-Tāmaki
Board
| rowspan=2| Onehunga
|-
|
| 13
| Neilson Street — Onehunga Wharf, Onehunga
, Penrose
, Mt Wellington
|
|-
| Auckland
— Maungakiekie-Tāmaki
/Puketapapa Boards
| rowspan=2| Hillsborough
|
| 15
| Route 12 Queenstown Road — Auckland City Centre
| Northbound exit and southbound entrance
|-
| rowspan=3| Auckland
— Puketapapa Board
|
| 16
| Route 15 Hillsborough Road
|
|-
| rowspan=2| Mount Roskill
|
| 18
| Route 4 Dominion Road
|
|-
|
|
| Sandringham Road/Maioro Street
| SH 20 and Southwest Motorway end
New Zealand
New Zealand is an island country in the south-western Pacific Ocean comprising two main landmasses and numerous smaller islands. The country is situated some east of Australia across the Tasman Sea, and roughly south of the Pacific island nations of New Caledonia, Fiji, and Tonga...
State Highway
New Zealand State Highway network
The New Zealand State Highway network is the major national highway network in New Zealand. Just under 100 roads in both the North and South Islands are State Highways...
linking State Highway 1 at Manukau
Manukau
Manukau City was a large territorial authority in Auckland, New Zealand. The city was sometimes referred to as South Auckland, but this term did not possess official recognition and did not encompass areas like East Auckland, which was previously within the official boundaries of Manukau City...
City Centre with Mount Roskill, via Mangere
Mangere
Māngere is one of the larger suburbs in South Auckland, in northern New Zealand.The suburb is located on flat land at the northeastern shore of the Manukau Harbour, to the northwest of the centre of Manukau city and 15 kilometres south of Auckland city centre...
and Onehunga
Onehunga
Onehunga is a suburb of Auckland City, New Zealand and the location of the Port of Onehunga, the city's small port on the Manukau Harbour. It is eight kilometres south of the city centre, close to the volcanic cone of One Tree Hill, Maungakiekie....
. 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
Auckland
The Auckland metropolitan area , in the North Island of New Zealand, is the largest and most populous urban area in the country with residents, percent of the country's population. Auckland also has the largest Polynesian population of any city in the world...
region and most of the upper North Island
North Island
The North Island is one of the two main islands of New Zealand, separated from the much less populous South Island by Cook Strait. The island is in area, making it the world's 14th-largest island...
. The route also forms the southern part of the future Western Ring Route
Western Ring Route
The Western Ring Route is a motorway system being constructed in Auckland, New Zealand. It runs along three existing state highways: the Southwestern Motorway , the Northwestern Motorway and the Upper Harbour Highway . When finished it will surpass the Southern Motorway to become the longest...
, 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.
Route and status
SH20 stretches from the Auckland Southern MotorwayAuckland Southern Motorway
The Auckland Southern Motorway is the major route south out of the Auckland Region of New Zealand. It is part of State Highway 1....
/ New Zealand State Highway 1 in Manukau City to Sandringham Road, Sandringham, in Auckland City
Auckland City
Auckland City was the city and local authority covering the Auckland isthmus and most of the islands of the Hauraki Gulf, in the North Island of New Zealand. On 1 November 2010 it was amalgamated into the wider Auckland Region under the authority of the new Auckland Council...
- 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.
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.
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.
The planned final terminus will be the Northwest Motorway
Northwest Motorway
The Northwestern Motorway , part of State Highway 16 , is the major western route and secondary northern route out of Auckland in New Zealand...
/ 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 16New Zealand State Highway 16
State Highway 16 is a New Zealand state highway linking Auckland City with Wellsford, via Auckland's Northwestern Motorway, Helensville and Kaukapakapa...
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
{| class="wikitable"|-
! colspan=2| Territorial authority
! rowspan=2| Location
! rowspan=2| km
! rowspan=2| Exit
Exit number
An exit number is a number assigned to a road junction, usually an exit from a freeway. It is usually marked on the same sign as the destinations of the exit, as well as a sign in the gore....
! rowspan=2| Destinations
! rowspan=2| Notes
|-
! Current
! New (from 1 Nov 2010)
|-
| rowspan="11"| Manukau City
| rowspan=4| Auckland
Auckland Council
The Auckland Council is the council for the Auckland Region in New Zealand. It began operating on 1 November 2010, combining the functions of the existing regional council and the region's seven previous city and district councils into one "super council" or "super city" governed by a mayor, 20...
— Otara
Otara
Ōtara is a suburb of Auckland, New Zealand, situated 18 kilometres to the southeast of the Auckland CBD. Ōtara lies near the head of the Tāmaki River , which extends south towards the Manukau Harbour...
-Papatoetoe
Papatoetoe
Papatoetoe is a suburb in the Auckland conurbation in northern New Zealand. One of the larger suburbs of the area commonly known as South Auckland, it is located to the northwest of central Manukau, and 18 kilometres southeast of Auckland city centre....
/Manurewa
Manurewa
Manurewa is the southernmost major suburb of Manukau City, one of the four cities that make up the metropolitan area of Auckland in the North Island of New Zealand. It is located 6km south of the Manukau City Centre, and 26km southeast of the Auckland CBD....
Boards
| rowspan=3| Manukau CBD
| rowspan=2| 0.0
|
|
SH 1 Southern MotorwayAuckland Southern Motorway
The Auckland Southern Motorway is the major route south out of the Auckland Region of New Zealand. It is part of State Highway 1....
south — Hamilton
Hamilton, New Zealand
Hamilton is the centre of New Zealand's fourth largest urban area, and Hamilton City is the country's fourth largest territorial authority. Hamilton is in the Waikato Region of the North Island, approximately south of Auckland...
, Tauranga
Tauranga
Tauranga is the most populous city in the Bay of Plenty region, in the North Island of New Zealand.It was settled by Europeans in the early 19th century and was constituted as a city in 1963...
| SH 20 and Southwest Motorway end
|-
| 1
|
SH 1 Southern MotorwayAuckland Southern Motorway
The Auckland Southern Motorway is the major route south out of the Auckland Region of New Zealand. It is part of State Highway 1....
north — Auckland
Auckland CBD
The Auckland CBD is the geographical and economic heart of the Auckland metropolitan area. Bounded by several major motorways and by the harbour coastline in the north, it is surrounded further out by mostly suburban areas...
|
|-
|
| 2
| Lambie Drive — Manukau City Centre
Manukau
Manukau City was a large territorial authority in Auckland, New Zealand. The city was sometimes referred to as South Auckland, but this term did not possess official recognition and did not encompass areas like East Auckland, which was previously within the official boundaries of Manukau City...
|
|-
| Puhinui
|
| 3
| Route 30 Cavendish Drive
| No southbound exit (use Puhinui Road)
Northbound entrance and connection to SH 20B and
|-
| Auckland
Auckland Council
The Auckland Council is the council for the Auckland Region in New Zealand. It began operating on 1 November 2010, combining the functions of the existing regional council and the region's seven previous city and district councils into one "super council" or "super city" governed by a mayor, 20...
— Otara
Otara
Ōtara is a suburb of Auckland, New Zealand, situated 18 kilometres to the southeast of the Auckland CBD. Ōtara lies near the head of the Tāmaki River , which extends south towards the Manukau Harbour...
-Papatoetoe
Papatoetoe
Papatoetoe is a suburb in the Auckland conurbation in northern New Zealand. One of the larger suburbs of the area commonly known as South Auckland, it is located to the northwest of central Manukau, and 18 kilometres southeast of Auckland city centre....
Board
| Puhinui
|
| 3
|
SH 20B Puhinui Road — Airport| No northbound exit (use Cavendish Drive)
Southbound entrance and connection to SH 20B and
|-
| rowspan=6| Auckland
Auckland Council
The Auckland Council is the council for the Auckland Region in New Zealand. It began operating on 1 November 2010, combining the functions of the existing regional council and the region's seven previous city and district councils into one "super council" or "super city" governed by a mayor, 20...
— Mangere
Mangere
Māngere is one of the larger suburbs in South Auckland, in northern New Zealand.The suburb is located on flat land at the northeastern shore of the Manukau Harbour, to the northwest of the centre of Manukau city and 15 kilometres south of Auckland city centre...
-Otahuhu
Otahuhu
Otahuhu is a suburb of Auckland. It is located to the southeast of the city centre, on a narrow isthmus between an arm of the Manukau Harbour to the west and the Tamaki River estuary to the east...
Board
| rowspan=4| Mangere
Mangere
Māngere is one of the larger suburbs in South Auckland, in northern New Zealand.The suburb is located on flat land at the northeastern shore of the Manukau Harbour, to the northwest of the centre of Manukau city and 15 kilometres south of Auckland city centre...
|
| 7
| Route 14 Massey Road
|
|-
|
| 9
|
SH 20A — AirportAuckland International Airport
Auckland Airport is the largest and busiest airport in New Zealand with over 13 million passengers a year, expected to more than double by 2025...
| No southbound entrance (use SH20B or Massey Road)
Carriageway mainline connects north to west, traffic proceeding from/to south on motorway must 'exit'.
|-
|
| rowspan=2| 10
| Walmsley Road
| Southbound
|-
|
| Coronation Road
| Northbound
|-
| rowspan=2| Mangere Bridge
Mangere Bridge, New Zealand
Mangere Bridge can refer to two places in New Zealand:*Mangere Bridge, New Zealand, a suburb of Auckland City*Mangere Bridge , the bridges that gave the suburb its name...
|
| 12
| Mahunga Drive — Mangere Bridge Township
Mangere Bridge, New Zealand
Mangere Bridge can refer to two places in New Zealand:*Mangere Bridge, New Zealand, a suburb of Auckland City*Mangere Bridge , the bridges that gave the suburb its name...
, Favona
Favona
Favona is mostly industry-dominated suburb of Auckland, New Zealand, and is part of the Mangere area. The suburb is in the Manukau ward, one of the thirteen administrative divisions of Auckland city, and is under governance of the Auckland Council....
| Southbound exit and northbound entrance
|-
| rowspan=2|
| rowspan=2|
| rowspan=2| Mangere Bridge
Mangere Bridge
Mangere Bridge, officially also called the Manukau Harbour Crossing, is a motorway bridge over the Manukau Harbour in south-western Auckland, New Zealand, crossing between the suburb also known as Mangere Bridge and the suburb of Onehunga...
over Manukau Harbour
Manukau Harbour
Manukau Harbour is the second largest natural harbour in New Zealand by area. It is located to the southwest of the Auckland isthmus, and is an arm of the Tasman Sea.-Geography:...
| rowspan=2|
|-
| rowspan="6"| Auckland City
Auckland City
Auckland City was the city and local authority covering the Auckland isthmus and most of the islands of the Hauraki Gulf, in the North Island of New Zealand. On 1 November 2010 it was amalgamated into the wider Auckland Region under the authority of the new Auckland Council...
| rowspan=2| Auckland
Auckland Council
The Auckland Council is the council for the Auckland Region in New Zealand. It began operating on 1 November 2010, combining the functions of the existing regional council and the region's seven previous city and district councils into one "super council" or "super city" governed by a mayor, 20...
— Maungakiekie-Tāmaki
Tamaki
Tamaki may refer to:Places:*Afghanistan**Tamaki, Afghanistan*Japan**Tamaki, Mie*New Zealand**Tamaki, New Zealand, a suburb of Auckland**Tāmaki , in Auckland**East Tamaki, a suburb of Auckland**Tamaki River, in Auckland...
Board
| rowspan=2| Onehunga
Onehunga
Onehunga is a suburb of Auckland City, New Zealand and the location of the Port of Onehunga, the city's small port on the Manukau Harbour. It is eight kilometres south of the city centre, close to the volcanic cone of One Tree Hill, Maungakiekie....
|-
|
| 13
| Neilson Street — Onehunga Wharf, Onehunga
Onehunga
Onehunga is a suburb of Auckland City, New Zealand and the location of the Port of Onehunga, the city's small port on the Manukau Harbour. It is eight kilometres south of the city centre, close to the volcanic cone of One Tree Hill, Maungakiekie....
, Penrose
Penrose, New Zealand
Penrose is an industrial suburb in Auckland City, New Zealand. It is located to the southeast of the city centre, at a distance of about nine kilometres, between the suburbs of Oranga and Mount Wellington, and close to the Mangere Inlet, an arm of the Manukau Harbour...
, Mt Wellington
|
|-
| Auckland
Auckland Council
The Auckland Council is the council for the Auckland Region in New Zealand. It began operating on 1 November 2010, combining the functions of the existing regional council and the region's seven previous city and district councils into one "super council" or "super city" governed by a mayor, 20...
— Maungakiekie-Tāmaki
Tamaki
Tamaki may refer to:Places:*Afghanistan**Tamaki, Afghanistan*Japan**Tamaki, Mie*New Zealand**Tamaki, New Zealand, a suburb of Auckland**Tāmaki , in Auckland**East Tamaki, a suburb of Auckland**Tamaki River, in Auckland...
/Puketapapa Boards
| rowspan=2| Hillsborough
|
| 15
| Route 12 Queenstown Road — Auckland City Centre
| Northbound exit and southbound entrance
|-
| rowspan=3| Auckland
Auckland Council
The Auckland Council is the council for the Auckland Region in New Zealand. It began operating on 1 November 2010, combining the functions of the existing regional council and the region's seven previous city and district councils into one "super council" or "super city" governed by a mayor, 20...
— Puketapapa Board
|
| 16
| Route 15 Hillsborough Road
|
|-
| rowspan=2| Mount Roskill
|
| 18
| Route 4 Dominion Road
|
|-
|
|
| Sandringham Road/Maioro Street
| SH 20 and Southwest Motorway end
External links
- "Mangere Bridge Opened Today". The New Zealand Herald. 25 July 2010. Retrieved 1 August 2010.