People in NSW should delay travelling to South Australia "as a precaution", as the state grapples with a potential second wave coronavirus outbreak, Gladys Berejiklian says.
The premier said NSW's borders "are completely open but if it's not essential travel think about whether you want to go in the next few days".
She offered the advice after the number of confirmed virus infections linked to the Parafield cluster in Adelaide northern suburbs grew to 20 on Tuesday. Another 14 potential cases are still to be cleared.