The government has yet to outline full costings for the project,saying the state will fund it with a contribution from BCC.
But Opposition leader Annastasia Palaszczuk said the scale of the new 15 metre wide,double decker tunnel could cause cost blowouts.
“I'm very concerned that a bigger tunnel will cost more money,and Campbell Newman and the Treasurer[Tim Nicholls] have not said where the money is coming from,” she said.
“I'm very concerned that this means one thing – asset sales.”