A new trailer-mounted speed camera will go where police have not dared - in school and road work zones and along motorways.

Queensland police commissioner Ian Stewart launched the trailer-mounted cameras in a bid to reduce the state's concerning road toll of 244, seven more than for the same time last year.

Police will roll out new trailer-mounted speed cameras in school and road work zones.

"These are very high risk areas. It's been unsafe in the past to put police into those areas ... so we have a small fleet of these trailer-based cameras from tomorrow," he said.

Commissioner Stewart said a quarter of the deaths in 2016 are directly a result of speeding.