The ACT Opposition has highlighted new figures showing a 40 per cent increase in the number of accidents happening at intersections where fixed speed cameras are installed.

Canberra Liberals transport spokesman Alistair Coe says Government figures show the combined number of accidents at nine intersections before fixed speed cameras were introduced was 39 per year.

But after they were installed the number of accidents at those locations rose to 55 per year.

Mr Coe says the cameras are generating revenue but clearly are not helping improve driver behaviour.

"Unlike mobile speed cameras which can be deployed to traffic hot spots, fixed speed cameras are locked in position and I think all motorists have seen people drive erratically, seen people slam on their brakes and do weird things," he said.

"And that's indicative of the figures which see a 40 per cent increase in the number of accidents around fixed speed cameras."

Mr Coe says the Government must review its use of cameras.

"Some of these fixed speed cameras are bringing in more than a million dollars a year ... so the motivation may well be revenue rather than road safety," he said.

But he says it is too early to say whether a Liberal government would move the cameras.

"It may turn out there are other locations in the ACT where these cameras could be better deployed to," Mr Coe said.

"But I think nothing is better than mobile speed cameras and nothing beats the police as a high-visibility deterrent to dangerous driving."

'No revenue raising'

The Government has defended its use of fixed speed cameras saying a range of factors could be behind the increase.

Transport Minister Simon Corbell says the figures do not show the whole picture

"They could be for example for accidents that are near the camera but not related to the camera. For example if there's an off or on-ramp near the fixed camera such as the Tuggeranong Parkway," he said.

He says the increase could also be because there are more cars on the road.

"We've seen a 10 per cent increase in the number of reported accidents across the ACT over the last 12 to 18 months and the reason for that has been the introduction of a new online crash reporting system when people no longer have to present to a police station but instead can record it all online," he said.

Mr Corbell has already announced a review of fixed speed cameras, and says decreased revenue shows they are not being used for revenue raising.

Revenue from fixed speed cameras topped more than $14.2 million in 2008-2009, falling to $11.2 million the following financial year.

In the 2010-2011 revenue totalled $9.96 million, dropping to $9.08 million this financial year.