It comes after Premier Steven Marshall announced a '40km buffer zone' between the Victorian-South Australian would be re-instated as of midnight Thursday, provided no cases of community transmission were recorded before then.

On Friday, South Australia closed its borders to all Victorian residents - except essential travellers - sparking outrage from cross-border residents who felt they had been unfairly shut off from essential services and excluded from the South Australian communities they felt connected to.

A Facebook page was born in response to the crackdown, where stories of divided families and children unable to access specialist medical care across the border were aired.

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On Tuesday, Mr Marshall told media that the hard border lockdown was the right decision to make at the time.

"When we first announced that this border arrangement would be put in place what we had seen then was a massive escalation in the number of active cases in Victoria, and the seeding of those active cases and community transmission within regional Victoria," he said.

"Since that the time the (Victorian government) has been able to put the stage four lockdown in place and significantly reduce the number of new infections in Victoria.

"We're not seeing seeding into regional Victoria. We're seeing those active cases along the border reducing down, and that's given the transition committee confidence to put that buffer arrangement back in place.

"We have always said that won't keep this (cross-border lockdown) in place one day longer than we need to."

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South Australian Chief Health Officer Nicola Spurrier said the decision to ease the cross-border restrictions would still have been made if there hadn't been a widely-publicised backlash against the crackdown.

"What we're doing is looking at the numbers in regions along with the Glenelg Shire, the Wimmera and other local government areas," she said.

"We're trying to base this as much as we possibly can on science and on evidence. I think the time is after that 14-day period, to be able to go back to that 40km buffer zone, which does make it easier for a large number of people."

There are three active coronavirus cases in Victorian local government areas neighbouring the border, with two cases in the Glenelg Shire and one in Mildura.

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Professor Spurrier felt the decision to tighten the border wasn't made prematurely.

"What the issue is - as the police commissioner has explained - is that we really needed to make sure people had adequate time to prepare, and in fact, the decision had been made a full two weeks prior. So, that's, in fact, three weeks ago," she said.

"Which is when, people will remember, we had very very high and an increasing number of cases in metropolitan Melbourne and also seeding into areas in regional Victoria."

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