The company released record earnings of $1.66 billion for the six months ending December 31 on Tuesday, saying it was in a good position to reap the rewards of inflation, with tolls set to rise in coming years.
Tolls had already crept up by six per cent across Sydney, the market update noted in its highlights section, released to investors on Tuesday.
The company is "well positioned for rising inflation and interest rates" and can expect tolls to rise by 20 per cent over the next four years.
"$1 of toll revenue in September 2021 would illustratively grow to approximately $1.20 in June 2025 and continue compounding thereafter," the report says.
It comes after the government opened new sections of Westconnex in January, including the M4-M8 tunnels from Haberfield to St Peters in Sydney's inner west, which were acquired by Transurban.
The document says further widening of the M7-M12 will be approved imminently.
Transurban also told investors it sees future monetisation opportunities in a series of yet-to-be-completed roads, including the M6, Western Harbour Tunnel, Sydney Harbour Tunnel and Beaches Link.
CEO Scott Charlton said the company's urban road placement meant they were able to capture a diversity of leisure, travel and commuting trips.
"It is pleasing to see traffic for the half setting a new record for the business," Mr Charlton said.
"In Sydney, the M4-M8 link was opened in January ahead of schedule and on budget."
"This milestone represents the final element of the city shaping Westconnex project to be delivered by the Sydney Transport Partners consortium.
"The consolidated Westconnex asset is expected to continue to grow over the near term and play a critical role in connecting more than $10 billion of government road projects over the next six years."
Labor roads spokesman John Graham said Sydney was the most tolled city in the world.
"This is a problem of the government's own making. They have signed secret contracts and privatised toll roads," he said.
"Those deals are driving these record tolls."
The government announced a review of Sydney's tolling system, which was due for completion last September.
Its release has been delayed until after the election next month.
"Toll reform is needed in Sydney, but the premier seems to have given up, instead hiding the toll review until after the election," he said.
"It should be released immediately."
