Motorists spending more than $25 a week on Sydney's toll roads over a year will be eligible for free vehicle registration, in a move Premier Gladys Berejiklian concedes will cost the state up to $100 million in the first year and even more into the future
The so-called rego rebate will save the majority of motorists who apply $359 a year on registration costs, and some up to $715.
"People have to use toll roads, not by choice, but because of where they live or what job they might have," Ms Berejiklian said.

Announcing the rebate on Monday, Ms Berejiklian hesitated at revealing the estimated hit to the state budget of the scheme but when pressed said it could be up to $100 million in the first year.
"It could be more than that amount into the future. This is a growing cost to government but we know we can afford it," she said.
