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Australia has recorded more than 4000 COVID-19 cases in a single day for the first time.

The unwanted record of 4110 infections nationwide comes just two days after the 3000-case mark was surpassed.

There are now almost 247,000 active cases across the country in total although only 110 virus patients are receiving intensive hospital care.

NSW posted 2482 new infections on Saturday, the most in a single day for any Australian state or territory since the pandemic began.

Victoria added 1504 cases along with seven virus-related deaths, and while numbers are low by comparison in other jurisdictions, they are beginning to climb.

Despite this, authorities say there will be more than enough COVID-19 vaccine to meet demand for boosters and for when children are eligible to receive the jab.

Vaccine providers have been advised to offer some flexibility over Christmas.

However the gap between second and subsequent shots will remain at five months, with the country's leading immunisation advisory group, ATAGI, saying the timetable for them won't be brought forward.

"They are the medical experts who decide those things, that is their job, to make the medical determinations about what the appropriate period is between a booster shot and the second vaccine," Prime Minister Scott Morrison told reporters in Hobart on Saturday.

"Now I know that that is under constant review, I know that they are looking at different timeframes but at this point, they've decided not to do that."

The head of Australia's vaccine rollout Lieutenant-General John Frewen says more than four million people will be eligible for boosters by year's end, rising to seven million in January and 11 million in February.

So far, more than a million Australians have received a third jab.

An extra 2.3 million people will also be able to receive the vaccine from January when five- to 11-year-olds become eligible.

However Lt-Gen Frewen says there won't be difficulty with supply.

While the Omicron variant continues to surge, states continue to ease restrictions.

NSW and Victoria will no longer require international arrivals to isolate for 72 hours upon arrival.

Fully vaccinated travellers will instead be required to get a test within 24 hours of landing and isolate until they get a negative result.

Saturday's record case numbers in NSW eclipsed the previous mark of 2297 set by Victoria on October 14.

South Australia posted a second consecutive state record with 73 cases, Queensland recorded 31 and the ACT 18.

Even so, Mr Morrison warned living with the virus under the national plan was not about case numbers.

"We need to be careful in how we talk about case numbers. We're not going to alarm people on case numbers," he said.

"What matters is hospitalisations, ICU, people on ventilators and severe illness."

Tasmania confirmed a fourth case after reopening its border to fully vaccinated travellers on Wednesday.

With cases leaking into the island state and Queensland, Western Australia is tightening its border to both.

From Monday, it will reintroduce a hard border to Queensland and force visitors from Tasmania to enter 14 days' quarantine.

© AAP 2021

If you've been saving up your annual leave due to COVID-19, you're not alone.

New figures from Roy Morgan have revealed Australian workers have accrued a record amount of annual leave.

The data showed 8.1 million Australians in paid employment have a combined 185 million days of annual leave owing to them, as of September this year.

It represents a more than 23 per cent increase on the 149.5 million days of leave available in September 2020.

The data showed a sharp rise in accrued leave coincided with the arrival of the Delta variant and lockdowns in eastern states.

Roy Morgan chief executive Michele Levine said ahead of Christmas and summer, there had been a substantial increase in the number of people with two or more weeks of leave owed.

"Now, 50.7 per cent of Australia's paid workers have at least two weeks leave compared to 46 per cent of paid workers a year ago," she said.

"There are now 1.39 million Australians who now have at least seven weeks of annual leave due, up from 1.22 million."

However, there have been fewer people in 2021 with less than two weeks of leave, compared to 2020.

Figures showed 10.7 per cent of workers have less than a fortnight owing to them of leave, compared to a bit more than 14 per cent last year.

Ms Levine said with people having large amounts of leave, there was added incentive for tourism operators to capitalise on the desire to travel.

"The largest markets of NSW and Victoria have been hardest hit by COVID-19 over the last two years and present the biggest opportunity for tourism operators in Queensland, Tasmania and South Australia to tap into," she said.

"It is more important than ever for domestic travel and tourism operators to appeal to the 6.7 million Australians who have at least two weeks of annual leave up their sleeve."

© AAP 2021

Speed warnings are making a comeback on NSW roads less than a year after the removal of fixed signs triggered a major boost in fines, but this time they will be atop mobile camera cars.

The number of motorists who have copped infringement penalties since fixed signage was removed across the state in November 2020 has escalated.

But from February large double-sided blue and white warnings will again appear, only they'll be on the roofs of all mobile speed camera vehicles.

Deputy Premier and Minister for Regional Transport and Roads Paul Toole says the new signs will be rolled out along with an additional previously announced 1000 fixed signs.

"This is about striking the right balance," he told reporters on Friday.

"There is no excuse for those who are speeding ... this is a government that has listened to the community."

In November, former NSW roads minister Duncan Gay told a parliamentary road safety inquiry the removal of the signs was done in good faith but was the wrong decision.

"Speed cameras are important but they shouldn't be there for entrapment," he said at the time.

Revenue NSW data shows the number of mobile digital speed camera fines where the speed limit was exceeded by 10km/h or less went from 3222 in October 2020 to 27,855 by February 2021.

Opposition leader Chris Minns welcomed the decision, saying common sense had prevailed.

"These hidden speed cameras were raising revenue on a giant scale in NSW like nothing we had ever seen before," he told reporters on Friday.

The removal of signs was about revenue raising, not road safety, he claimed.

"They were on track to collect more in one year than they collected in the previous five years, combined.

"We would much rather someone not commit the offence in the first place, rather than receive a fine in the mail two to three weeks after the offence has been committed."

The government says camera revenue goes directly into the Community Road Safety Fund to improve road safety and provide education, lifesaving infrastructure and enforcement.

© AAP 2021