The issue is a very pertinent one for the Canberra region, as any "leakage" out of the NSW lockdown greatly exposes people in Canberra and the local region to the risk from the highly infectious Delta variant of the coronavirus.

With over 30cm of snow falling in the NSW snowfields in the past 72 hours (as well as snow across parts of Canberra) there is temptation for skiers and snowboarders from inside the red zones of Greater Sydney, Shellharbour, the Central Coast and Blue Mountains to head south to the Perisher and Thredbo resorts.

The head of the Monaro Local Command John Klepczarek warned that police were watching the roads carefully and would be checking on travellers' bonafides.

"We are very much aware of this [lockdown leakage] issue, and that people have been using the app to try to change their addresses," Supt Klepczarek said.

"From a police point of view, it's disappointing because after all, what we are trying to do is to keep people safe because this is not a criminal issue, it's a health issue.

"Obviously we can't check everyone coming in but an advantage from a policing perspective is that there is only one road in and out of the snowfields so we can put in assets such as roadside random breath testing, where we check everyone's details and places of residence."

Automated number plate recognition is also proving useful, too, with NSW Traffic and Highway Command vehicles able to "flag" the registration plates of drivers who have been stopped and warned before, or who have have a previous breach recorded against their vehicle.

"It sounds a bit corny but from the police point of view, it's a team effort; it operates like a filter, or a sliding defence," Supt Klepczarek said.

"We know that anyone who attempts to breach the lockdown via routes like the Federal highway and don't have an exemption will first have to pass through our Hume patrol district.

"Those Hume district officers are watching the highway, just as we are down here.

"We know, too that people have to stop for food and fuel so police are keeping an eye on those places in Goulburn, Marulan and Sutton Forest."

Under the Public Health Order effective until midnight on Friday 30 July, every employer across NSW must require a worker to work from home unless it is "not reasonably practicable".

People over 16 years of age must carry evidence of their address when in a vehicle with another person and provide it to police upon request.

READ MORE COVID-19 NEWS:

He said that there were around 1000 exemptions for vehicles required for essential travel from NSW and through the Hume and Monaro police districts, including through and into the ACT.

"We are pretty well resourced for the task we have but it does very much depend on people doing the right thing and not leaving the [local government area] lockdown zones," he said.

"I'm in regular contact with our officers down at Cooma and Jindabyne and I'm told that the carparks at the ski resorts are full of Canberra number plates and during the week the numbers of cars entering are low.

"That's obviously good for Canberrans but I'm sure the resorts are feeling the financial pinch."

Our journalists work hard to provide local, up-to-date news to the community. This is how you can continue to access our trusted content: