The NSW Auditor-General will examine the $16.8 billion WestConnex toll road for a second time, due to the huge cost, risks and level of public interest in the project.
A day after the NSW government said it had knocked back the only bid it received to build a major interchange for WestConnex at Rozelle in Sydney's inner west, the state's Audit Office has confirmed it will again turn its attention to the project.
Yet another review of Australia's largest motorway project could cause political headaches for the government before the next state election in early 2019.
The 33-kilometre toll road project has been controversial due to the disruption caused by construction, compulsory acquisition of properties and concerns about the longer-term impact on local roads from extra traffic.
Audit Office executive director Barry Underwood said it was decided the project should be looked at again because of its sheer size, cost and risks, the level of public interest and the fact that it had reached another stage in its development.
However, Auditor-General Margaret Crawford had yet to decide what the scope of the audit would be, and this was unlikely to be confirmed until next year.
That means the audit is unlikely to occur until the 2018-19 financial year. Mr Underwood said it was too early to say whether Sydney Motorway Corporation, the entity the government set up to oversee the construction and operation of WestConnex, would be examined thoroughly in the audit. Labor transport spokeswoman Jodi McKay said it was "high time" some light was shone on the way in which the project had been managed.