Documents reveal the Government has been told repeatedly there might not be enough money to pay for its flagship transport project.
But the Government says the roads of national significance programme will go ahead, and there will be money for its other scheduled transport plans as well.
Transport Agency and Transport Ministry documents from the past two years show there could be a funding shortfall for all transport projects of between $500 million and $2.5 billion this decade.
One document says that after 2012 the roads of national significance programme places demands on the National Land Transport Fund it cannot meet, and the Transport Agency might have to reschedule other state highway projects to stay within budget.
Transport Minister Gerry Brownlee says there will be enough money. "These are seven very significant roads," he says.
"A number of those projects are started, they will be completed and we believe we can achieve most of this in the 10-year period that we've set out to do that."
The Labour Party says it's clear the Government needs to rebalance the transport budget.