Analysis of NSW Road Toll Data has revealed that if toll revenue continues at its current rate, the M4 widening will be paid off by September 2019.
Despite this, Liberal Premier Gladys Berejiklian has locked Western Sydney into paying tolls for 43 years.
Regular Western Sydney commuters are slugged more $2,000 a year travelling on the M4, making the toll one of the biggest cost of living issues of the election.
NSW Labor Leader, Michael Daley said: "The Liberals are keeping their M4 toll, while Labor is re-introducing the M4 Cashback.
"The voters of Western Sydney have a clear choice."
This follows Premier Berejiklian announcing that there will be a second new M4 toll under a Liberal Government in the Sky News leader's debate. Then in a late night tweet she said she wouldn't introduce a new M4 toll.
In the debate the Premier was asked if there would be a second toll west of Parramatta. She said there would be under the Liberals. This part of the M4 is currently toll-free.
"Every person I speak to is already feeling the pinch from rising costs. Western Sydney motorists shouldn't have to pay this unfair toll for 43 years." Labor's candidate for Penrith, Karen McKeown said.