Southwestern Motorway
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| Southwestern Motorway | ||||
| Route information | ||||
| Maintained by NZ Transport Agency | ||||
| Length: | 19 km (12 mi) | |||
| Existed: | 1977 – present | |||
| Major junctions | ||||
| South end: |
 SH 1 Southern Motorway at Manukau City Centre
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| SH 20B at Puhinui SH 20A at Mangere |
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| North end: | Maioro Street at New Windsor | |||
| Highway system | ||||
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State Highway 20, also known as the Southwestern Motorway, is a New Zealand State Highway linking State Highway 1 at Manukau City Centre with Maioro Street in 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 Western Ring Route, a 48 km motorway route bypassing central Auckland.
SH 20 stretches from the Auckland Southern Motorway / State Highway 1 at Manukau to Maioro Road. From south to north the motorway passes through, or adjacent to, the suburbs of Wiri, Mangere, Onehunga, Hillsborough and Mount Roskill.
The motorway (and SH 20) currently terminates at Maioro Street. The planned final terminus will be the Northwest Motorway / New Zealand State Highway 16 via the Waterview Connection scheduled to open in early 2017.
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Wikipedia