Ten new speed and red-light cameras will be added in Adelaide after an audit found the devices mostly helped reduce crashes.

Key points: The Liberals promised a speed camera audit ahead of the state election to see which locations were needed for safety reasons

The Liberals promised a speed camera audit ahead of the state election to see which locations were needed for safety reasons The audit found they did mostly help reduce crashes

The audit found they did mostly help reduce crashes Two cameras will be cut and 10 others added

However, two others will be axed on roads where have not been any accidents in recent years.

Police Minister Corey Wingard announced safety cameras on Glover Avenue in the city and Frederick Road in Royal Park would be removed because they were not needed for "safety purposes".

The camera are both "mid-block" rather than at intersections or railway crossings.

They earned the State Government $390,000 in the first 10 months of 2018, out of $45 million collected from fixed speed and red-light camera fines statewide.

"While I have asked for some cameras to be removed immediately, I have requested the Department of Transport and Infrastructure and SA Police to review their methodology for selecting fixed camera locations, as recommended in the audit," Mr Wingard said.

"Areas that have high crash history, or are of high risk because they may be located near schools or pedestrian crossings, then those sites may be eligible for a camera."

The audit — announced in June and completed in September — was promised by the Liberal Party ahead of last year's state election.

"South Australians need assurance that speed cameras aren't being used as a cash cow for the government," the party said during the campaign.

Data analysed by the Centre for Automotive Safety Research found there were 21 per cent fewer crashes in the five years after speed and red-light cameras were installed at 35 Adelaide intersections.

"In comparison, crashes at the same intersections for approaches that did not have safety cameras fell by only 7.2 per cent," they found.

Survey results back up revenue-raising concern

A public survey conducted as part of the audit found that of the 28 per cent of respondents who opposed cameras, 88 per cent said they were focused on revenue-raising rather than road safety.

The cameras attracting the most ire in the survey were two on the South-Eastern Freeway in the Adelaide Hills, followed by the one which will be removed on Glover Avenue.

The two on the freeway generated $4.3 million in January–October 2018, according to SA Police figures.

Three new speed and red-light cameras will be installed on Main North Road at its intersections with Maxwell, Tolmer and Ifould roads.

Two more will be installed at the intersections of Tapleys Hill and Old Port roads in Royal Park and Unley and Greenhill roads in Unley.

All of the intersections have a crash history, according to the Government.

Five more cameras will be installed at pedestrian crossings outside schools.

Mr Wingard said larger signs would be installed at fixed camera locations and a single website dedicated to speed, speed management and safety cameras would be created.

"Making signs more visible and simpler by changing the wording from safety cameras to speed and red light cameras will make drivers more aware of cameras ahead and hopefully result in them slowing down in risky areas," he said.