Case Study

CityLink Tulla Widening Gantry Rectification Project

  • ClientCPB Contractors
  • StartMarch 2020
  • Value$30m
  • CompleteSeptember 2020

Following the collapse of a large sign onto the Tullamarine Freeway in 2019, this project replaced the N03-15 gantry on CityLink, as well as rectifying and strengthening 15 other gantries between the Bolte Bridge and Tullamarine Airport.

Doing 'it' better

Finished ahead of schedule with zero lost-time injuries

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  • Acting as the project’s ‘Nominated Authority’ (approved by Transurban and the Department of Transport)
  • Managing welding supervisors, NDT technicians, crane crews, welders, painters and electrical installation crews
  • Guiding and monitoring a 20-strong team to rectify gantries
  • Overseeing the fabrication of the steel strengthening supports and components needed to rectify the gantries, as well as the new gantry


  • Parts weighing up to 140kg
  • Working with the fabrication workshop to ensure each component was designed and made to exacting quality standards
  • N03-15 gantry had to be installed in a short road closure window – with no overruns
  • Extensive planning to install gantry components with cranes during the road closure


  • Using photogrammetry to scan the 15 gantries needing rectification
  • Ensured every new component was made to the unique specifications of the gantry it was intended for, ensuring an exact fit, first time
  • After installation, each gantry was scanned again to become the job’s ‘As-builts’


  • Providing Transurban, the Independent Reviewer and Department of Transport with comprehensive daily progress reports.
  • Accuracy and detail in the reports created a strong bond of trust, meaning the parties only visited the site four times during the entire project – each time providing positive feedback.


  • Safety: 0 Lost Time Injuries
  • Program: Finished ahead of schedule

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  • Martin Simic – Gantry Fabrication Nominated Authority

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