The NSW government has defended the price motorists will have to pay to use the yet-to-be-built WestConnex motorway in western Sydney, saying it will be the second cheapest toll road in the city.
Roads minister Duncan Gay on Thursday released details about the distance-based toll pricing on the $11.5 billion network of motorways and tunnels that will link the city's west and southwest suburbs with its port, airport and CBD.
The government says the average toll across the whole WestConnex route will be $4.50.
Mr Gay said it would be the city's second cheapest toll road.
"These will be amongst the lowest tolls in the city ... on today's tolling figures there is only one lower toll in the city, and that's the Lane Cove tunnel," he told reporters.
"We can't put this new infrastructure in without tolls."
Construction on stage one of the project, which involves widening the M4 between Parramatta and Homebush and extending the motorway to Haberfield via tunnels, is set to begin in 2015, with the whole network due for completion in 2023.
Mr Gay conceded that he didn't know how much time motorists would save when using the widened M4 between Church St Parramatta and Homebush Bay Drive.
Motorists will pay a maximum $3.90 toll for using that part of the project, the government says.
Earlier, the government announced a dedicated body headed by Business Council of Australia president Tony Shepherd would oversee construction of the motorway project.The average toll across the whole WestConnex will be capped at a maximum of $7.35, with a minimum price of $1.50.