The NSW government has vowed to fix the state's flood-ravaged road network with $500 million in new funding. 

Local councils will get access to the funding pool to repair hundreds of thousands of potholes.

Premier Dominic Perrottet said the money would become available to both regional and metropolitan councils within weeks. 

"We have listened to councils and we understand the pressure they are under from many months of wet weather," Mr Perrottet said. 

"We recognise potholes are a major hazard right now. This critical funding injection will help every council across the state patch up potholes as well as carry out other emergency repair work." 

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Last month, a report by the NRMA found a backlog of $1.9 billion in funding for councils to repair broken roads across NSW. 

NRMA spokesperson Peter Khoury said the backlog would get even larger when the full extent of the damage from the 2022 floods was realised. 

Mr Khoury told ABC the half-a-billion-dollar cash injection was a good start to tackling the problem. 

"This is going to take years to fix … but this money will certainly give councils the start they need," Mr Khoury said. 

"$500 million will go a long way to fixing a large number of the potholes that have severely damaged the road network in New South Wales." 

The new funding will help councils fix landslips, potholes and other damage to roads. 

Funding will not be allocated according to the severity of flood damage experienced by local councils.

Instead, the amount each area receives will be determined by the total length of roads the council manages.

Some 56 per cent of the funding is expected to go to regional councils, with priority given to those that experienced major flooding in 2022, including Lithgow, Bathurst, Parkes and Forbes.

The rest will go to councils across Greater Sydney. 

NSW Regional Roads Minister Sam Farraway said work should begin this month as councils funnel the new funding through to existing road repair projects. 

"A lot of councils already have plans in place and contractors in place," Mr Farraway said. 

"This funding is going to give councils the certainty that they can ramp up those operations, that the cash is in their bank account, and they don't have to worry about cash flow.

"I envisage by the end of January, regional councils will start receiving their funding. And within a week after that metropolitan councils will start receiving their funding."

Shadow Roads Minister John Graham said while the funding was welcome, it was not enough. 

"It will fix about 20 per cent of the pothole and road damage across the state," Mr Graham said.

"[This is] based on Local Government NSW's estimate that there's been $2.5 billion damage to our road network as a result of rain and flooding.

"It was clear that councils couldn't do this by themselves, we welcome the fact that [the state government has] come to the party today.

"This won't do the whole job but it's a very welcome start."