The changes will affect the areas shown below (can be downloaded here):
The work will take place from now to early August. Details of the works and potential impacts (eg lane closures and speed limits) can be downloaded here.
The end results will be two lanes in each direction along Cook Street and changed lane structure (I guess to help long trucks) for the turns onto and off the West Gate Bridge from/to Todd Road. Very detailed diagrams of the final layouts can be downloaded as follows: