There are calls for Australia’s blood-alcohol limit for driving to be reduced to 0.00 following a crash that killed four children in Sydney’s west.

Three siblings and their cousin were killed when an alleged drunk driver mounted the kerb in Oatlands over the weekend, smashing into the children.

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Three other children were injured.

Royal Australasian College of Surgeons’ National Trauma Committee chair Dr John Crozier told 7NEWS.com.au the tragic crash is a reason to “pause and reflect”.

The man had been driving a 4WD ute. Credit: 7NEWS

“Alcohol is a key contributor to a range of preventable crashes and the tragedy of many deaths and lives lost around Australia,” he said.

“That’s a frequently repeated occurrence.”

Learn from other countries

Crozier said there is evidence that reducing the blood-alcohol limit for all drivers could significantly reduce the road death toll.

The blood-alcohol limit in New South Wales is 0.05 for full licence drivers and 0.00 for learners and P-platers.

He said a 0.00 limit is appropriate and Australia should look at countries like Norway - where the blood-alcohol limit is 0.02.

A makeshift memorial has been set up at the crash site. Credit: Joel Carrett / AAPIMAGE

“Their penalties were also things from which we can learn,” Crozier said.

Crozier added tougher penalties should be imposed on offenders to prevent recidivism.

“People that have already offended not uncommonly and often repeat offences and sometimes those are fatal or have fatal consequences,” he said.

“So there are opportunities with existing enforcement measures to use to greater effect.

Driver charged

Samuel William Davidson, 29, has been charged over the fatal crash, allegedly returning a blood-alcohol reading of three times the legal limit.

He faced court on Sunday, charged with 20 offences, as the victim’s family members visited a makeshift memorial set up at the crash site.

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Danny Abdallah, the father of three of the children, said the crash had left him numb.

“These kids were just walking innocently, enjoying each other’s company and this morning I woke up I’ve lost three kids,” he said on Sunday.