The speed cameras on Memorial Drive are the least effective in the Illawarra when it comes to stopping crashes, according to a NSW government review.
The review also found that the camera on the Princes Highway outside The Illawarra Grammar School was the Illawarra's worst performer in terms of reducing injuries.
But a Transport for NSW spokeswoman said that any reduction was a good thing.
The Centre for Road Safety conducts an annual review of all red-light cameras and both fixed and mobile speed cameras.
The review focuses on five areas - fatalities, injuries, casualties (fatalities and injuries combined), crashes and casualty cost - comparing figures from the most recent five-year period with the five years prior to installation.
In the five years before the camera was installed outside TIGS there were 19 accident-related injuries and 18 in the past five years. That equates to just a 5 per cent reduction in injuries. The next lowest was the Memorial Drive cameras, which saw a 24 per cent reduction.
The best performing camera when it came to reducing injuries was the southbound camera on the Southern Freeway at Gwynneville. Injuries dropped from seven to just one - an 86 per cent reduction.
The pair of cameras on Memorial Drive saw just a 10 per cent reduction in crashes in the relevant five-year period - from 39 to 35. The next lowest figure was at the camera outside TIGS, which has seen a crash reduction of 21 per cent.
In terms of reducing crashes, the best-performing cameras were at Northcliffe Drive, Warrawong, and the northbound camera on the Southern Freeway.
Both cameras saw a 59 per cent drop in crashes.
The Transport for NSW spokeswoman said any reduction in crashes or injuries was a good thing.
"If a speed camera saves one life or injury, then it is doing its job," she said.
The spokeswoman said that the NSW government was committed to reviewing the performance of all speed cameras each year.
"The 2013 speed camera review found that overall there has been a 42 per cent reduction in the number of crashes, a 90 per cent reduction in fatalities and a 41 per cent reduction in injuries at fixed speed camera locations," she said. "On current trends, this would represent 53 lives saved and 780 injuries prevented."
She said the cameras were evaluated on both crash and casualty reduction and pointed out that while the Memorial Drive cameras had led to just a 10 per cent reduction in crashes, they also saw a 23 per cent reduction in casualties.
Similarly, the camera outside TIGS had seen a 21 per cent drop in crashes.
The cameras at Memorial Drive were the subject of a review after the 2012 camera study due to an increase in casualties.
The spokeswoman said that, after the review, the cameras were deemed effective.
"The detailed field review found that the fixed speed camera at Memorial Drive, Corrimal, would not have prevented the increase in casualties at the location because of the type of crashes that had led to the increase," she said. "For example, in the after period there were a number of crashes at a nearby intersection, some of which involved alcohol.
"It was recommended that the camera remain in operation along with additional road safety treatments to improve safety at the camera location."
She said the camera was improving the safety of that area.