New South Wales Premier Kristina Keneally revealed on Tuesday that several Sydney's road systems and transportation may not push through.

According to confidential emails and briefing obtained by the opposition in the upper house of parliament and was leaked to News Limited, expansions from F3 to M2 may not happen before 2026 while M2 to M4 East tunnel expansion may not be fully utilized at all.

The documents also reported that Ms. Keneally vetoed any reference or citations in the blueprint of an upgrade to the F6 to Wollongong.

However, Ms. Keneally explained the government accepted that road projects may not likely happen in the near future.

“We actually identified that these projects are not in the 10-year funded envelop. That's because we can't promise infrastructure that we can't afford,” she told a local radio network on Tuesday.

Ms. Keneally added that projects may have pushed through sooner if NSW produced funding or investments from the federal or the private-sector.

"We simply don't have the capacity in the next 10 years, in that $50 billion funding envelope, to bring those into that 10-year time frame," she said.

She added that it would be ridiculous to reason out that state's roads budget went bankrupt.

Meanwhile, Andrew Stoner, the opposition transport spokesperson, said an action will take place but has not committed yet to fast track or revive any pending projects under the coalition government.

"We'll be putting forward, I think, a positive alternative to the current government which has no money, no plan," Mr Stoner said in a Fairfax Radio Network interview.

He also revealed the coalition will seek for joint federal and state funding as well as private sector funding to commence construction of the pending road projects.

On the other hand, NSW Greens spokesperson Lee Rhiannon suggests that Ms. Keneally and Opposition Leader Barry O'Farrel should focus on public transport, highlighting heavy and light rail projects and bicycle networks as top priorities.