SA Libs promises to revamp road fines

The South Australian Opposition has pledged to revamp the state's system of road and other fines if the party wins Saturday's state election.

Liberal Leader Steven Marshall says fines have been used by the Labor government as a revenue-raising measure, describing some as disproportionately high or unreasonable.

He says a Liberal government would reform the expiation notice regime to ensure the primary purpose is improving community and road safety.

An independent audit of the safety impact of fixed speed and red light cameras will also be conducted with $1 million a year allocated for an independent authority, separate from the police and the courts, to provide South Australians with an avenue to have fines reviewed.

"Fines are a key penalty for unlawful behaviour, play an important role in maintaining law and order and ensure that people comply with standards of community safety," Mr Marshall said in a statement on Tuesday.

"However, disproportionately high or unreasonable expiation notices undermine the respect of South Australians for our justice system and the effectiveness of our state's entire legal system."