State Opposition Leader Chris Minns has given a strong indication the M6 (F6) won't be extended beyond Kogarah if Labor wins the 2023 election.
"More toll roads for the most tolled city in the world? Haven't we probably got enough", he said.
Mr Minns was speaking to the Leader after announcing at the state ALP's annual conference a Labor government would scrap plans for a $10 billion toll road tunnel for northern beaches motorists and redirect the money into public transport for western Sydney.
The first stage of the M6 is due to be completed in 2025.
Mr Minns said Labor would look "very closely" at whether to build any further stages and announce a policy before the election.
"At the last election, the NRMA said the first stage of the M6 would act like a magnet and lead to a 20 per cent increase in local traffic," he said.
"I am not convinced more toll roads are the answer.
"Obviously the government doesn't have plans for it to go any further."
Attorney-General and Cronulla MP Mark Speakman said he was "very keen to see the rest of the M6 built but, more importantly, to see no road design which cuts the shire in half or impacts on amenity".
"Any future stages of the F6 will involve a huge amount of taxpayers' money and there will be rigorous analysis to ensure the benefits outweigh the cost," he said.
The new Premier Dominic Perrottet has pledged to make infrastructure in western Sydney a major priority, which could impact on further funding for the M6.
Mr Speakman said, "Development pressure is growing far more rapidly in western Sydney, so it is expected there will be more new infrastructure, but I will be fighting to make sure the shire gets its fair share in transport, health, education and other areas".
In May 2021, the then Transport and Roads Minister Andrew Constance appeared to give a strong indication the M6 might go no further than Taren Point.
Mr Constance said, "We are doing our homework at the moment, but it makes a lot of sense to actually build that second stage [to Taren Point] and that will be complete".
A spokeswoman later issued a further statement, saying the full length of the route, which was reserved in 1951, was still being investigated.
"The NSW Government is investing $30 million towards developing the next stage of the M6," the spokeswoman said.
"This work includes confirming the preferred alignment, the project scope and a final business case.
"This work will consider the full length of the M6 corridor from President Avenue at Kogarah to the Princess Highway at Loftus.
"These pieces of work are required before the NSW Government can consider an investment decision in further stages of the M6."
Two further stages were originally projected - stage two from Kogarah to Taren Point and stage three from Taren Point to Loftus, where the 1951 road reservation runs through a corner of Royal National Park.