Coolac Bypass Project

The Hume Highway is the main freight route between Sydney and Melbourne.  It is also a vital transport link for communities and industries in southern NSW.



The Works on the recently completed $150 M Coolac Bypass involved:


  • 11.8km of new plain concrete base dual carriageway motorway.
  • 4.1km of new NB carriageway on improved alignment.
  • Grade separated interchange at Cootamundra Road including a voided slab bridge (2 spans) over the dual carriageways.
  • New twin bridges over a private property machinery access.
  • New twin bridges over Daisy Bed Creek.
  • Twin bridge underpass for local traffic at Coleman St in Pettit using twin voided slab bridges (single span)
  • Replacement of narrow bridge at Muttama Creek with new twin bridges (7 span, driven RC piles and PSC planks) and demolition of the existing bridge.
  • Provision of roadworks for rest areas for each direction of traffic.
  • Approximately 1.5 million m3 of earthworks.
  • Approximately 300,000 m2 of new concrete pavement.
  • The construction of the project involved several stages with temporary traffic arrangements.
  • The work was progressively opened to traffic as each stage is completed.
PES developed specific checklists and safeguards against sub base cracking and was foremost in developing and enhancing the RTA specification for PCB following some significant cracking on this and the two adjacent alliance projects.  These documents are now integral in the management of future CRCP and PCB contacts in South Western Region. cb-001