Planning Minister Vickie Chapman says the variation to regulations will ensure shelves remain stocked, helping to meet increased demand and prevent supply chain delays.

"When the pandemic hit at the start of last year, we saw supermarket shelves stripped bare as people rushed to stock up on the essentials," Ms Chapman said.

"This put immense pressure on the supply chain and delivery drivers, who rushed to get food and goods back on the shelves.

"The government responded then, as it is now, to ease the delivery time limits, enabling around-the-clock deliveries.

"It means South Australians can have complete confidence that all of your essential supermarket needs are being restocked regularly and in a timely manner."

The regulatory changes will remain in place until September unless an earlier date is designated.

The Australian Logistic Council welcomed the measures as grocery delivery drivers felt the pinch during lockdowns in a number of states.

"Freight drivers are under enormous pressure as a result of snap lockdowns and increased demand," chief executive Rachel Smith said.

"Lifting of delivery curfews is a necessary step in alleviating pressure in the supply chain.

"Freight and Logistics workers are the unsung heroes of the pandemic, providing essential groceries and goods to vulnerable communities and those that need it most."

Australian Associated Press