Drivers who speed through a single red light could soon find themselves slugged with fines of more than $900 under the State Government's plan to install fixed speed cameras at Queensland intersections.

Drivers will be stung twice - once for running a red light light as well as for speeding, - when plans to digitise the state's 34 red light cameras are eventually rolled out.

Drivers will be pinged a standard $225 for running a red light, while speeding penalties can range anywhere from $100 to $700.

That means red light leadfoots could pay up to $925 with the single flash of a camera bulb under the new scheme, announced last Sunday as a way to curb the state's mounting road toll.

Police Minister Judy Spence yesterday confirmed motorists who sped through intersections when lights were still green or amber would also be penalised.

"Speeding and failure to comply with a red traffic control signal are two separate and distinct offences. So if there is evidence of two offences police would prosecute both offences," Ms Spence said.

The brisbanetimes.com.au yesterday revealed the Bligh Government stood to reap more than $60 million a year from the introduction of fixed speed cameras, prompting criticism the scheme would be used as a taxpayer cash grab.

Shadow Police Minister Vaughan Johnson today accused the State Government of "blatant revenue raising", while Queensland's peak motoring body, RACQ, revealed the motoring public was equally skeptical about its motives.

Questions have also been raised about the effectiveness of the plan.

"There is anecdotal evidence to support that more fatal accidents occur on major highways, not at congested intersections," Mr Johnson said.

"I therefore don't see how the speed cameras attached to red lights is anything but a concealed bid to raise revenue."

"While I support speed cameras, police presence on our roads is the answer...the sight of a police vehicle on the road does more to deter motorists from speeding than anything else."