   | |
|---|---|
| Upper Harbour Highway (SH 18) Upper Harbour Motorway (SH 18) Northwestern Motorway (SH 16) Southwestern Motorway (SH 20) | |
 | |
| Route information | |
| Length | 48 km (30 mi) |
| History | First section completed in 1955. Route completed in 2017. |
| Major junctions | |
| North end |  SH 1 near Rosedale |
SH 16 at Westgate SH 16 at Waterview  SH 20A at Mangere  SH 20B at Puhinui | |
| South end | SH 20 at Manukau |
| Location | |
| Country | New Zealand |
| Major cities | Greenhithe, Hobsonville, Massey, Te Atatu, Waterview, Mount Roskill, Onehunga, Mangere, Auckland Airport, Wiri |
| Highway system | |
The Western Ring Route is a motorway system in Auckland, New Zealand. It runs along (from south to north) the entire Southwestern Motorway (State Highway 20), most of the Northwestern Motorway (part of SH 16), the entire Upper Harbour Motorway, and the entire Upper Harbour Highway (the last two forming SH 18).[1] When the Upper Harbour Highway is upgraded to motorway status, the route will surpass the Southern Motorway to become the longest motorway in New Zealand at 48 kilometres in length. It runs through Manukau, West Auckland, and the North Shore, bypassing the Auckland city centre and thus providing a second motorway route through the Auckland isthmus.[1]
- ^ a b "Western Ring Route". NZ Transport Agency.