Look left
If you knew me, you wouldn't question.
The Vicroads document recommends a minimum road clearance of 4.6m.
Vicroads don't get to regulate vehicle dimensions, thats the role of the RVCS section of DIRD that publishes the Australian Design Rules which are a legislative instrument. ADR 43/04 specifies a maximum height of 4.3m.
Overdimension is possible, but a completely different kettle of fish.