Police have said not every car coming through checkpoints would be stopped during Melbourne's lockdown, and The Border Mail has been told V/Line buses are at times among vehicles waved through on the Hume Freeway.

Wangaratta-based MP Tania Maxwell has asked Public Transport Minister Ben Carroll what is being done to ensure Melburnians abide by stage four restrictions.

"It has been raised with me that the validity of passengers' reasons for travel on these routes are not being appropriately checked in any way before they leave Melbourne, during their journey, or even when they disembark," she said.

"Reportedly, a number of passengers have also been travelling on these buses and trains recently without wearing masks.

"I also understand there is growing frustration among V/Line staff that multiple warnings and concerns being voiced by them about these problems are going unheeded both by V/Line management and Victoria Police."

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Ms Maxwell heeded advice for regional MPs to not travel to Melbourne for this week's sitting, but her contributions were still included in the hansard record.

She said at a time when the "so-called 'ring of steel' around Melbourne is not being fully enforced", it was bemusing that "basic livelihoods, and critically important professions are now so disrupted around the border". "

The people of Northern Victoria are experiencing ridiculously bureaucratic, illogical and unequal treatment. For us, in areas with low, or no, coronavirus cases, the purported cures are actually more disruptive than the disease," she said.