A review of Western Australia's Office of Road Safety shows it has proved ineffective in managing a huge fund fed by speed and red light camera fines.

About $90 million per year goes into the fund, which is meant to be used to improve road safety.

About $90 million per year goes into the fund, which is meant to be used to improve road safety.

But the independent review concluded the Office "did not have the capacity to meet the many increased challenges of road safety, not the least being the management of ... fines revenue and the management of the many projects flowing from the Road Trauma Trust Account funding".

"There is clearly an urgent need for greatly improved Office of Road Safety processes in executing, monitoring, evaluating and acquitting Trust Account-funded projects," the report by Peter Browne Consulting said.