In some months since warning signs were removed from in front of mobile speed cameras in late 2020, Wagga drivers have been hit by an 940 per cent increase in fines.

As a compromise in August, then transport minister Andrew Constance decided to return the warning signs but only in fixed locations to advise drivers that mobile cameras operated in the general area and those signs have yet to be used in Wagga.

Mr Fang said he had made approaches to ministers in order to advocate for the return of warning signs in front of mobile speed cameras.

"The change in the leadership recently presented an opportunity so I presented my arguments, which are the same as I presented in November last year and I was told they would revisit the issue," Mr Fang said.

"Now it does appear that common sense has prevailed."

This week Premier Dominic Perrottet asked Roads Minister Rob Stokes to look into the decision to remove warning signs from mobile speed camera sites.

"I had concerns that there was a greater focus on revenue raising where there shouldn't be," Mr Perrottet said.

"There needs to be a focus, first and foremost, on road safety. We've been looking at and reflecting on the current policy and we'll be announcing some changes shortly."

A NSW Parliamentary inquiry into speed cameras heard from representatives from Cootamundra-Gundagai Regional and Snowy Valleys councils, who said visible speed cameras were a greater deterrent than hidden ones.

Former Coalition roads minister Duncan Gay also told the inquiry putting signs in front of speed cameras was a good way to incentivise safer driving.

Mr Fang said Mr Gay's comments "were a pretty good measure of how bad the policy was".

"I don't think anyone would say that we shouldn't monitor speed and that speed isn't a factor in crashes, but that is different from entrapment, which is what we were seeing without the warning signs," Mr Fang said.

"Coupled with the increase in hours of mobile speed camera operations would only result in more fines and more losses of licences and that would have a detrimental effect on people's lives.

"I'm happy for them to increase the hours of enforcement but at least give people a warning."

Wagga driving instructor Glen Gaudron said he supported a return of the warning signs.

"I've heard of one person being fined three times in one day. If you get pulled over by police for speeding, you are going to be damn careful afterwards; with hidden speed cameras, you only find out weeks later," he said.

The possible reintroduction in warning signs close to mobile speed cameras has been condemned by the Royal Australasian College of Surgeons as "a backward step in road safety".

Dr John Crozier, the chairman of the National Trauma Committee for the college, said the organisation was appalled by the potential policy reversal, which would result in more deaths on NSW roads.

"Populist appeal and politics is threatening a proven road safety measure, which NSW had only recently introduced, following years of leadership by most other jurisdictions in Australia," Dr Crozier said.

"Acting on fake news claiming the primacy of the measure as a revenue raiser will result in preventable death and serious injuries on our roads in NSW if the warning signs are reintroduced.

"As surgeons we see the consequences of injuries is significantly worsened by even minor speeding offences. Removing warning signs encourages drivers to comply with road safety rules, reducing the occurrence of financial penalties or loss of demerit points."

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