NSW Transport and Roads Minister, Liberal MP Andrew Constance, announced last week that the warning signs would be removed over the next 12 months.

Member for Murray Helen Dalton said it was important for the results of the changes to be analysed, and improvements made to the state's road network.

"I'd like to see the evidence on what impact taking away warning signs has on road safety and how the revenue raised is spent," Mrs Dalton said.

"I think what irks country people the most is that there are other aspects of road safety as well - if government is going to raise more revenue through fines, they also need to fix black spots, pave roads and invest in rail to get trucks off the road.

"If they did that, they'd be more support for measures like this.

"In my long trips across my giant electorate, poor road quality seems to be my biggest safety concern."

Wagga-based Nationals MLC Wes Fang criticised his Coalition colleagues over the decision to remove warning signs from in front of mobile speed cameras.

Mr Fang said the decision by "city-centric Libs" was an "absolute disgrace and unfairly targets regional and rural motorists" due to "longer distances and higher speed limits in the bush" .

"This is a major shift in policy for the Coalition, yet it was not presented to the joint partyroom in either of the past two sitting weeks," he said.

"This is just another example in a long line of Liberal Party city centric policy decisions, and I've had an absolute gutful."

A spokesperson for Mr Constance denied this claim, stating that "all Government MPs and MLCs, both lower and upper house, were invited to attend a briefing on the road safety changes."

Mr Constance said the decision would save lives and bring NSW's policy in line with other states.

"This is about changing culture and changing behaviour. We've seen it happen with our world leading mobile phone detection program, where the rate of people offending has steadily declined," Mr Constance said.

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

Mr Fang referenced incidents in 2013 where Wagga drivers had complained that warning signs were not being placed in readily visible locations, which then Roads Minister Duncan Gray labelled as 'entrapment' for motorists.

"Speed cameras have a place, but so do fair warnings and equity between city and rural and regional people," Mr Fang said.

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