Each year, the NSW Centre For Road Safety conducts an annual review of all speed cameras across the state.

The review looks at fatalities, injuries and crashes at each camera location and also calculates the ‘‘casualty cost’’ to the community.

To gauge a camera’s effectiveness, the figures from the most recent five-year period is compared to the last five years before they were installed.

The twin cameras on Memorial Drive were the least effective in the Illawarra over the past year and were the only ones in the region to record no reduction in fatalities.

The cameras oversaw just a 7 per cent reduction in injuries and casualties when compared to the period before installation.

The cameras were installed in 2002 and questions were raised about their effectiveness in 2012 due to an increase in fatalities.

However the review concluded the cameras ‘‘contributed to a significant reduction in casualties’’ and they remained in place.

General manager for the Centre for Road Safety Marg Prendergast said the Memorial Drive cameras contributed to a 13 per cent reduction in crashes and that the number of speeding infringements issues had declined over time.

The latest study shows there was a fatality in the past five years, but this could not be linked to the cameras.

‘‘The recent fatality, which occurred at an adjacent intersection, was not speed related and not something that could have been prevented by the fixed speed camera,’’ Ms Prendergast said.