The Rozelle Interchange (West Connex 3b) project connects the extended M4 and the new M5 to the Anzac Bridge and Victoria Road in Sydney. The underground motorway is excavated by up to 20 roadheaders and is the most complicated network of tunnels constructed anywhere in Australia.

Surex is currently providing all the surveying required for excavation of this ground-breaking mega project. This includes calculation of all the tunnel profiles and ground support, maintaining the roadheader and bolter guidance systems, monitoring and final lining.