Round 4 of the UniSA Australian HPV Super Series scheduled at the Bend Motorsport Park for Saturday, July 31, has been cancelled.
This follows the announcement of South Australia's seven-day lockdown.
As a result, the HPV Super Series training sessions scheduled for this Sunday, July 25, have also been cancelled.
UniSA Australian HPV Super Series chairman Andrew McLachlan said the situation was disappointing for all involved, but uncertainty made the cancellation the only available decision.
"These decisions are difficult and not taken lightly, but in the best interests of our community," he said.
"We understand and feel the frustration and challenge this creates for all of us. We look forward to that time in the future when we can resume more normal operations."