INTRODUCTION
SH20 (South Western motorway from Mt Roskill to Wiri) was extended through Manukau City to SH1 with links to the North & South. We assisted the Alliance of Downer & Leighton’s to monitor & report on the programme.
Other project facts:
- 920,000 cubic metres earthworks
- 68,000 square metres pavement
- 4.5km long
- 3 interchanges
- 12 bridges