A NSW government public health alert issued yesterday afternoon mandates that those who cross the Victorian border into NSW must follow must follow stay-at-home restrictions.

Exceptions apply for those living among the NSW-Victoria border, but the NSW government website indicates that Wagga lies just outside that border bubble.

Wagga residents will not need a permit to travel into Victoria but must carry a valid form of photo ID with a current address when travelling. They will then need to self-isolate upon returning.

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NSW premier Gladys Berejiklian said a lockdown would "make things safer" for people in NSW, provided people follow the rules.

"If you've been at an exposure site, if you've been to Greater Melbourne, all those other areas that have been identified, please do the right thing," Ms Berejiklian said.

"Please make sure you monitor for symptoms, get tested, isolated when you're asked to do so."

Those who return from across the border must follow all the same restrictions faced by Victorians, including mandatory face masks when outside the home.

They must also stay at homes at all times except for shopping, caregiving, work, exercise, or to receive a vaccination.

Member for Wagga Joe McGirr said he was encouraging people to follow the rules handed down by the department of health.

"I would urge anyone returning to Wagga from Victoria to follow the government's guidelines for the sake of everyone in the community," Dr McGirr said.

"The more people that follow the rules, the safer we will be and the sooner we can return to business as usual."

Ron Finemore Transport managing director Mark Parry said Wagga's supply chain would remain uninterrupted, and that they would be applying once again for border permits for their drivers.

He said it was exasperating, but that the process should not take too long and that freight would be crossing through Wagga as normal.

Mr Parry said their truck drivers would have their work cut out for them, working around the clock to replenish Woolworths' shelves in Victoria amid more toilet paper panic buying.

"I'm supportive of things that need to be done to control COVID. Although I've got to say I'm disappointed the whole state's locked down - it's only happened in one state and it's now happened three times," Mr Parry said.

"While this is a significant inconvenience for the state of Victoria and particularly small businesses, transport will continue to operate as it always has."

The border bubble comes after another 12 confirmed COVID-19 cases were detected in Victoria, bringing the total number of active cases to 34 at time of writing.

The "circuit-breaker" restrictions came into effect at midnight on Thursday and are planned to be in place for seven days.

Those under the lockdown restrictions must stay within a five kilometre radius of their homes except for those essential activities.

Only one person per household can go shopping, and then only for essentials such as food and supplies.

Private and public gatherings are not allowed, however they will be allowed to visit and receive visits from an "intimate partner".

More information about the border restrictions can be found on the NSW government website: nsw.gov.au/covid-19/rules/border-restrictions.

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