Southwest Motorway
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| Southwestern Motorway | ||||
| Route information | ||||
| Maintained by NZ Transport Agency | ||||
| Length: | 25 km (16 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: |
 SH 16 Northwestern Motorway at Point Chevalier
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| 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 State Highway 16 in Point Chevalier, 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 kilometres (30 mi) motorway route bypassing central Auckland. It is the only New Zealand State Highway that is entirely motorway.
SH 20 stretches from the Auckland Southern Motorway (SH 1) at Manukau to SH 16 at Point Chevalier. From south to north the motorway passes through, or adjacent to, the suburbs of Wiri, Mangere, Onehunga, Hillsborough, Mount Roskill, Mount Albert, Waterview and Point Chevalier.
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