The minister said the removal of warning signs will be rolled out over the next 12 months and will only affect mobile speed cameras.

The move is similar to the government's decision not to post signage warning of the presence of a mobile phone detection camera.

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Signs warning drivers of fixed speed cameras will remain in place.

"This is about changing culture and changing behaviour," Mr Constance said.

"We've seen it happen with our world-leading mobile phone detection program, where the rate of people offending has steadily declined.

"No warnings signs mean you can be caught anywhere, anytime and we want that same culture around mobile speed cameras."

Mobile speed cameras are used at a number of sites across the Illawarra, including Bellambi Lane at Russell Vale, the Illawarra Highway at Albion Park Rail, Flagstaff Road at Berkeley, Murphys Avenue at Gywnneville and along Appin Road.

Mr Constance said new laws would also be introduced to bring in harsher penalties for those caught driving with a combination of drugs and alcohol in their system.

"Research shows you are 23 times more likely to crash if you are under the influence of both alcohol and drugs - this massive, life-threatening risk needs a stronger penalty," Mr Constance said.

"Across our roads network we have seen this reckless and irresponsible behaviour result in far too many deaths and serious injuries, and these tougher penalties send the message that this behaviour won't be tolerated."

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