Are stage 4 coronavirus lockdown restrictions coming to Victoria and what are they?

There's no definition of what stage four might mean, what the new rules would be or when it could come into effect in Melbourne, but Victorian premier Daniel Andrews hasn't ruled it out

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As Victoria grapples with more than 200 new Covid-19 cases each day, questions are being asked of the premier, Daniel Andrews, and the chief health officer, Prof Brett Sutton, about whether tougher restrictions - or stage 4" lockdown measures - are on the cards.

There is no definition of what stage four may involve given no one can predict what case numbers may look like in a month, let alone a week's time, and therefore what responses may be necessary.