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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 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. == Route == SH 20 stretches from the Auckland Southern Motorway / New Zealand State Highway 1 at Manukau to Sandringham Road, Sandringham, in Auckland City. 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 2017.〔(Auckland Motorways - The Waterview Connection )〕 ;Airport connection SH 20, SH 20A, and SH 20B form an almost triangular shape between the Puhinui Interchange of the Southwestern Motorway, Auckland International Airport, and the SH 20/SH 20A motorway junction. The Southwestern Motorway bypasses Auckland International Airport, with spurs SH 20A from the north and SH 20B from the east both providing airport access. SH 20B leaves SH 20 at the Cavendish Dr/Puhinui Rd/Roscommon Rd Interchange of the Southwestern Motorway and travels west along Puhinui Road to the airport. SH 20B officially terminates at the intersection with Orrs Road. 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 SH 20A terminating just north of the roundabout with Verissimo Drive. From there the road continues south to the airport. NZTA are currently planning to turn SH 20A into a motorway for its entire length by turning the intersection at Kirkbride Road (and a known black spot) into a grade-separated intersection. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「New Zealand State Highway 20」の詳細全文を読む スポンサード リンク
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