Police road policing command Assistant Commissioner Mike Keating said the eight intersections were chosen based on crashes that involved speed and red-light related incidents.

"The combined red light and speed cameras have [been] proven to reduce the incidence of speeding and red light running at these intersections," he said.

Assistant Commissioner Keating said red light-running was often associated with speeding and there was no single reason why drivers did it.

"What we do know is that the resulting crashes are likely to be T-bone crashes, which have a higher potential of causing death or serious injury," he said.

From Monday, the new combined red light and speed cameras were operational at:

• Glenlyon Street, Gladstone Central, at the intersection with Tank Street; and
• Anzac Avenue Road, Kippa-Ring, at the intersection with Boardman Road.

The following intersections were upgraded from a red light camera system to a combined red light and speed camera:

• Morayfield Road, Morayfield, at the intersection with Caboolture River Road;
• Lutwyche Road, Lutwyche, at the intersection with Norman Avenue;
• Lutwyche Road, Kedron, at the intersection with Kedron Park Road;
• Old Cleveland Road, Coorparoo, at the intersection with Cavendish Road;
• Smith Street, Southport, at the intersection with Kumbari Avenue; and
• Bermuda Street, Burleigh Waters, at the intersection with Christine Avenue.

There have been signs installed at the intersections advising motorists that a combined red light and speed camera system was operating.

The amount of revenue collected from speeding motorists was expected to soar by 47 per cent over the next four years as more speed cameras were rolled out across the state.

In 2017-18, the estimated actual revenue collected from speed camera fines was $160.6 million.

That figure was expected to balloon to $237.2 million by 2021-22.