History
The first section of what would become the Southwestern Motorway was the Onehunga Bypass from Queenstown Road, Hillsborough to Neilson Street, Onehunga but the start of the motorway proper was not completed until 1983 when the bypass was connected through the new Mangere Bridge to Coronation Road, Mangere.
The northern section was extended first to Hillsborough Road, then to Hayr Road, then to Maioro Street, the last section opening on 15 May 2009.
The southern section was extended to Puhinui Road in 1997, along with the extensions SH20A and SH20B connecting to Auckland International Airport. The final southern section connecting Puhinui Road to State Highway 1 at Manukau was completed in 2010. A duplication of Mangere Bridge, with future provision for rail, was also opened in 2010.
Read more about this topic: New Zealand State Highway 20
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