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  Planning, design and construction of the WestConnex underground motorway project, Sydney, Australia

  WestConnex is a new urban motorway scheme in Sydney, Australia aimed at relieving the current severe congestion on the city’s road network. Over 70% of the total route length of 33 km will be accommodated in 3 or 4 lane tunnels with significant underground interchange works. The project was first proposed in its current form in 2012. However, in the relatively short time since two of the three major stages of the project have been tendered and design and construction contracts awarded, with construction underway since mid 2016. The third and final stage of the scheme, which is currently in the planning and procurement phase, will complete this ambitious AUD$17 Billion (US$13 Billion) scheme by 2022, only ten years from its conception. This paper will describe the need for this scheme, the planning approval and procurement of the stages and also provide a brief insight into several technical matters relating to the design and construction of the tunnelling works.

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