Westconnect – M4 Widening

WestConnex is Australia's largest infrastructure project, linking Sydney's west and southwest with the city

Motorways & Roads
  • Sydney, Australia
  • Motorways & Roads
  • Completed: 2017


Total investment


  • Motorway, length 7,5 km;
  • Viaduct length 1,859 m (deck area 21,120 sqm);
  • 50 spans (30 to 50 m);
  • Foundation piles (diam. 1200-2700 mm/length 6,1-19,8 m);
  • Total number of driven piles 860.


Design and construction of the widening of M4 Motorway, as part of the first stage of the largest Australian urban road project.
The M4 is an upgrade of one of the main arteries in Sydney linking the West and Southwest parts of the city with the airport and the seaport.
Rizzani de Eccher, together with JV Partner Leighton, expanded the motorway to four lanes in each direction (total length of 7,5 km) and constructed two elevated structures, a 1,850 m-long viaduct and the 311,5 m-long Duck River bridge.

Companies involved

Rizzani de Eccher

Our group

General contracting

Specialized contracting

Other activities