Police Commissioner Grant Stevens has warned further restrictions may be imposed as he urges all South Australians to remain vigilant and continue to use the QR code check-in following the emergence of a third COVID exposure site at Tailem Bend.
It was revealed on Wednesday that the OTR Motorsport Park service station site had been visited by individuals on Friday, July 9 who have tested positive to COVID-19.
In a press conference on Wednesday evening, Mr Stevens warned new restrictions could be put in place as SA Health raced to trace visitors to the exposure site.
He said a meeting today would decide if the "evolving situation requires any further steps".
"This is a harsh warning to people of South Australia, to make sure you do the right thing - QR Code, obey the social distancing requirements, adhere to the COVID-safe plan requirements of hospitality locations you attend and get a test if you have symptoms.
"I need people to understand just how serious this is and how close we are to imposing further restrictions on the community of South Australia - we are not doing that now, but it is something we are actively considering as we watch what is happening in other places."
Mr Stevens said the Tailem Bend situation was "an alarm bell going off for people to understand just how serious the situation is".
People who have been at the service station between 7.20am and 8.15am on the Friday have been urged to go into quarantine and be tested.
The trio also visited the Tailem Bend Shell Service Station and Coolabah Tree Cafe on Friday evening.
Mr Stevens said there were 25 QR code check-ins at Shell despite 76 credit card transactions recorded.
As of midnight last night, all people coming from Greater Melbourne must undertake level one testing - they must have a test within 24 hours of arriving in South Australia - and cannot go to a high risk location such as an aged care facility until they have a negative result.
All freight drivers coming into the state must show evidence of a negative COVID test in the prior 48 hours upon arrival, and if they do not have that they must have a test within 24 hours.