Vic road toll warrants almost $687m

Outstanding Melbourne road toll warrants totalled almost $687 million last year.

Figures from Victoria's Department of Justice and Regulation show $686,924,234 was owed by motorists over 2014/15.

"The requirement to pay a toll fee is well publicised and motorists actively choose to drive on toll roads," a department spokeswoman said.

"While the majority of people do the right thing, unfortunately, there are always a small percentage who choose to flout the law."

Infringements are issued when people don't pay tolls and the matter can then progress to a warrant, which might land the matter in court.

Public transport minister Jacinta Allan said 99 per cent of road users paid their tolls, so it was only a small pool who failed to do so.

"That's consistent with any infringement type system across any transport network," she told reporters on Friday.

"Obviously, as issues like this arise there is the opportunity to review it, to look how practice can be improved."

Greens leader Greg Barber said the government was acting as a debt collector for companies such as Citylink.

"That creates a huge burden on the public purse, but of course it means your dispute with your company actually ends up being something that they can enforce on you in the courts," he said.

Opposition spokesman Robert Clark said people who didn't want to pay their toll fees had to be held to account, and those who lacked capacity to pay had to be identified early so something could be done about it.