Sophia Naismith was struck and killed in June 2019 when a high-powered Lamborghini mounted a curb outside a restaurant in the Adelaide suburb of Glengowrie.

The driver, Alexander Campbell, was on Thursday found not guilty of causing death by driving. He will instead plead guilty to the lesser offence of driving without due care.

South Australian Premier Peter Malinauskas on Saturday announced his government would introduce road safety reforms in Sophia's honour, following strong advocacy work from the Naismith family.

"Every South Australian following the tragic loss of Sophia Naismith cannot help but admire the courage shown by her parents and family," Mr Malinauskas said in a statement.

"I hope these reforms will prevent such a tragedy from happening to another family.

"Work will now commence to bring these reforms to fruition."

The changes will include a new licensing scheme for people who want to drive high-powered sports cars, similar to licences for those who use motorcycles or trucks.

Drivers accused of killing a person will not be allowed to hold a licence until their case is resolved and there will be a ban on people disabling traction control in high-powered vehicles.

The legislation will start being drafted immediately, Mr Malinauskas said.

Australian Associated Press