Victoria's "roadmap for reopening" from coronavirus lockdown has not been well received by the Federal Government.

Prime Minister Scott Morrison described the plan as "crushing news", saying he hoped Victoria's trigger points for easing restrictions were a worst-case scenario.

"What I can't help but be struck by is that under the thresholds that have been set in that plan Sydney would be under curfew now," Mr Morrison said.

"Sydney doesn't need to be under curfew now. They have a tracing capability that can deal with outbreaks."

So, when Mr Morrison made his claim, were case numbers in NSW higher than the Victorian curfew threshold? RMIT ABC Fact Check investigates.

Under Victoria's roadmap, two criteria must be met for the removal of Victoria's curfew: a state-wide daily average of fewer than five cases over two weeks; and fewer than five cases in total with an unknown source over a two week period.

In both raw and population-adjusted terms, NSW's coronavirus numbers do not meet these criteria.

Even when netting out hotel quarantine cases from NSW's figures, the state still does not fall under the threshold.

Excluding travellers in hotel quarantine, Sydney recorded an average of 7.4 new cases per day on the date of Mr Morrison's claim.(AAP: Steven Saphore)

However, linking the number of NSW cases and its contact tracing capability to the Victorian roadmap is problematic.

Victorian Premier Daniel Andrews announced Victoria's stage 4 coronavirus lockdown — including the introduction of a curfew — on August 2, as the state recorded 354 new cases. Two days later, on August 4, case numbers in Victoria peaked at 686.

Case numbers in NSW have been far lower. After an initial surge beginning in March was brought under control, daily cases peaked at just 22 on August 10.

As Victoria's Department of Health points out, Victoria's thresholds for easing restrictions are not the same as the thresholds for reintroducing restrictions.

And as one expert contacted by Fact Check noted, stronger measures might be needed coming out of lockdown than during "maintenance phase".

The verdict: Yes, but more to it