Auckland Southern Motorway
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| Route information | |
| Maintained by NZ Transport Agency | |
| Length: | 46 km (29 mi) |
| Existed: | 16 July 1953 – present |
| Major junctions | |
| North end: |
 SH 1 Northern Motorway at Auckland City Centre
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 SH 16 Northwestern Motorway at Auckland City Centre SH 20 at Manukau City Centre SH 22 at Drury
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| South end: |
SH 1 Waikato Expressway at Bombay
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| Location | |
| Primary destinations: |
Auckland City Port Auckland Airport Manukau Papakura Drury |
| Highway system | |
The Auckland Southern Motorway (also known as the Southern Motorway, and historically as the Auckland–Hamilton Motorway) is the major route south out of the Auckland Region of New Zealand. It is part of State Highway 1.
The motorway is 45 kilometres in length, with 28 junctions including termini. It runs from the Central Motorway Junction in central Auckland, through Manukau City, Papakura, and Drury, before terminating onto the Waikato Expressway at the top of the Bombay Hills.
The Southern Motorway starts just north of the Central Motorway Junction (Spaghetti Junction) on the west side of central Auckland. The motorway is a direct extension of the Northern Motorway, which changes to the Southern Motorway just south of exits 424C and 424D.
For the first kilometre, the road is two lanes each way due to the constraints of the Victoria Park Viaduct to the north. The motorway then delves deep into the Central Motorway Junction, turning eastward to form a southern boundary to the Auckland CBD, the turning south-eastwards as it leaves the junction. There are several exits northbound only through the junction, connecting to the city centre and the Northwest Motorway.
South of the junction is the busiest section of the motorway, and busiest section of road in New Zealand carrying an average of 200,000 vehicles per day, and to cope with this, the short section between Khyber Pass Road and Gillies Avenue is five lanes wide each way. A large volume of traffic leaves at Gillies Ave to head for Auckland International Airport.
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Wikipedia