South Australia to ease coronavirus border restriction with Victoria by extending buffer zone

South Australia's border "buffer zone" with Victoria will extend from 40 kilometres to 70 kilometres under an easing of coronavirus restrictions announced today.

The change will come into effect from midnight on Wednesday night.

Meanwhile, Premier Steven Marshall said he was happy with how South Australians responded to eased restrictions over the weekend, which allowed people to drink standing up outdoors at licensed venues.

He said that had given the state's transition committee confidence to consider further changes.

"The first of those is to change the buffer zone on the South Australian-Victoria border from 40 kilometres to 70 kilometres," he said.

"This will come into effect as of midnight tomorrow night, so for those people who are coming in from Thursday morning onwards."

He said it would "provide huge relief" to people within the 40km–70km area.

Travellers from other states including New South Wales will also be able to come into South Australia via Mildura, as long as they are in Victoria only in transit.

This would avoid the longer drive through Broken Hill.

It will also allow residents of towns just across the border from Mildura in NSW to enter South Australia.

SA Health has since announced two new cases of coronavirus diagnosed in overseas travellers staying in hotel quarantine in Adelaide.

The department said the woman and the man, who are both aged in their 20s, remain isolated and pose no risk to the public.

Mr Marshall said the transition committee was also considering the possibility of relaxing testing requirements for border residents.

"Currently, it's once per week — there is some suggestion of once a fortnight — we're trying to get national consistency; we'll hopefully have some advice on that in the coming weeks," he said.

Those with approved passes are able to travel for work, school, medical reasons and shopping.

South Australians living within 70km of the Victorian border will also be able to cross into Victoria and then return.

The State Government is also reviewing the crowd size allowed at AFL games at Adelaide Oval, but will announce any changes closer to the preliminary final next Friday.

Port Adelaide's match against Geelong had a crowd of 25,000, but Mr Marshall said he expected more people to be allowed to the preliminary final.

"That's great news for footy fans," he said.