Victoria introduced a "hard border" with South Australian from midnight on Thursday, as South Australia reported 23 active COVID-19 cases in the state.

The "hard border" will be in place for 48 hours before a permit system comes into effect.

The final details of the permit scheme were still forthcoming, but reasons such as essential work, receiving medical care, essential shopping and agricultural work have been listed as reasons to enter Victoria from South Australia.

Mr Meyer said it was good to see "agricultural work" specified and hoped there would be more clarity in the coming days.

"They have said that agriculture can keep going, but is that a total exception?" he said.

"Our biggest fear is harvest. A lot of people deliver into the Frances or Wolseley silos, and a lot of beans get delivered to Keith.

"We need some absolute certainty on the harvest deliveries so we're not greatly affected."

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Mr Meyer said another immediate concern was border residents who might currently be in South Australia as part of the cross-border travel exemption.

"We are wondering about those kids who travel across the border for school - will they be able to make it home?" he said.

Mr Meyer said travel for medical purposes also required clarification.

"It says that there will be exemptions for medical, but does for someone who needs to go to Adelaide for medical attention or surgery, can they come home again afterwards?" he said.

Mr Andrews vowed to support border communities at his press conference on Thursday.

He said the state government had been working with local councils near the border to help navigate the new rules.

"We're not looking to make things more difficult. In fact, we'll provide any and all support we can to those communities," he said.

However Mr Meyer said as far as he was aware, there had been little consultation as of Thursday afternoon.

"One of our officers is in a meeting with some relevant people ... but in talking to the (West Wimmera Shire) CEO, there's been no direct contact that I am aware of," he said.

"So what consultation with border communities actually means, I guess we will find out."

Mr Meyer also raised concerns with the truck driver testing site set up near Nhill.

"The closure isn't close enough to the border. It has the potential to push trucks onto our roads," he said.

"It's easy to bypass (the site at Nhill), and when they do, it's going to put heavy traffic back on our local roads that we will need to stand the bill for.

"These roads are already way behind in maintenance levels, and it will deteriorate the road even more."

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