Labor has called on the NSW government to install signs letting drivers know how much tolls cost, saying motorists have paid $100 billion already.
"This is a common sense measure which helps drivers," Opposition Leader Chris Minns said on Monday in a statement describing Sydney as "the most tolled city" worldwide ahead of a parliamentary inquiry hearing into road tolls.
The opposition would like to place signs at toll tunnel entrances - known as decision point signage - that would allow drivers to make an informed decision on whether they actually need to use the toll road.
Opposition roads spokesman John Graham argued that it was crucial that drivers knew about fluctuating toll prices.
"They (Treasury NSW) just will not say how much drivers are paying in tolls in total .
"We believe that information should be public. It's more than $100 billion," he told reporters outside parliament on Monday.
"If you go shopping at any store in the city, the price of the goods will be displayed on a sticker. We believe the same should apply to toll roads."
During the hearing, Mr Graham described the government's lack of willingness to provide detailed data about toll revenues as a "state secret".
"It's coming out of the pockets of working people .... who don't have the luxury to commute into the city," he said.
Drivers make around one million trips on tolled roads and tunnels in and out of Sydney, according to a report commissioned by the inquiry last year.
Transurban, one of the country's largest toll operators, maintains that economic benefits to the state in terms of infrastructure totals nearly $110 billion.
Premier Dominic Perrottet dismissed Labor's suggestion about signs letting drivers know how much tolls cost as advertising for the operator rather than an exercise in transparency.
"If their (Labor) policy is putting signs up across the state that's just a sign that they're out of ideas and don't understand the real challenges when it comes to the cost of living," he told reporters.
"To provide toll road operators with advertising to come into their toll roads I don't think helps anyone."
