In 2015, Infrastructure Australia recommended that WestConnex be included on the Infrastructure Priority List as ‘Threshold’.

WestConnex is a program of around 33 km of interconnected road projects that will extend the M4 motorway towards Sydney city, widen the M5 East motorway and join the two motorways with a new tunnel. Infrastructure Australia recommended revised demand modelling and a final project capital cost estimate be provided before the project is ‘Ready to Proceed’.