Regional Transport and Roads Minister Paul Toole said the large blue and white retractable, double-sided warning sign would give motorists fair warning that they were passing a speed camera.

"We need to strike the right balance between giving a fair go to the majority who are trying to do the right thing and ensuring those few who continue to deliberately risk lives cop the fine they deserve," Mr Toole said.

"There is no excuse for speeding - and with these new signs, in addition to the 1000 fixed signs we're already rolling out, motorists will have every opportunity to change their behaviour and ensure the safety of everyone on the road."

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Transport and Roads Minister Rob Stokes said the rollout of signage would take several months, with the priority on marking vehicles that are currently unmarked.

"This was always about saving lives, and we will continue to find ways to reduce the number of lives lost on our roads as we aim towards zero fatalities by 2050," Mr Stokes said.

"The focus on safety as well as awareness will ensure the program is still effective in reduce speeding and the significant trauma it causes.

"We know that it takes all of us to make the right decisions whenever we get behind the wheel, so while we're giving people that extra warning, we need everyone to slow down and drive to survive."

NSW Labor leader Chris Minns said the signs were a "win for common sense" after pushing for their use.

"The hidden speed camera policy did not work. It made families poorer, but it did not make our roads safer," he said.

"Warning signs change behaviour and get drivers to ease off the pedal and slow down.

"The success of NSW Labor's campaign shows what we always knew - the approach of the Perrottet Government was about revenue raising and not road safety."

Every dollar from speed camera revenue goes directly into the Community Road Safety Fund to improve road safety and provide road safety education, lifesaving infrastructure and enforcement.