Just think how good it would be though if it had of been built years ago. Preemptively improved Melbournes transport during the population boom it has experienced in the last few years.
Roads don't do that. In a city the size of Melbourne the roads that go to the places people want/need to get to just absorb all those cars. The only way to improve congestion is to give people a *different* way to get there. To get them off the road. It isn't rocket surgery, the tailsbacks are worst in the places where the access to/amount of public transport is also worst. It's been known for half a century that duplication on the busiest train lines would make a huge difference, it allows them to run *express* services at peak times. Giving trains an alternate route through the city stations (expanding the City Loop) is the other, you can't keep adding trains from the suburbs if they just have to line up in a train jam at either Flinders St or Southern Cross. The new Metro is supposed to do this, but I think it is too small.
I bombarded the then Minister with letters and emails begging them to consider expanding the Metro to include a link from North Melbourne to Collingwood. They could even use the new "Arden" station. It would include an massive underground hub at the Queen Vic Market as part of a badly needed upgrade of that site. It would become a new entrance point for visitors to the city and would include dedicated storage for stall holders. It would be much safer than the current forklift F1 course. It would allow for a St Vincent's/Exhibition Building/Museum stop. By having a cross branch in the system it would also be possible to bypass the City Loop altogether.