Looks like the road will be sunk to create an underpass for vehicles that will provide better access to the new St John of God Midland Public & Private Hospitals especially emergency vehicles without having to wait at a level crossing. The Interstate/Freight Railway Line will travel over the top of the new underpass.
First time in a long time in Perth that an underpass in this calibre will be built.. I have a feeling the height of freight trains might have had an influence in the decision to go with the underpass rather than a standard bridge over the railway line.
Could be in for some delays/temporary closures of the line during construction.
More info including the plan can be found on the Main Roads WA website: