The figures keep blowing up when it comes to paying for our Roads of National Significance, and critics say some of the justifications are shonky

Has justifying our massive spend-up on roads been 'juiced by some convenient maths' or are New Zealanders not capable of seeing the big picture?

Guests:

• Matt Lowrie - Greater Auckland director
• Nick Leggett - Infrastructure New Zealand chief executive
• Marc Daalder - Newsroom senior political reporter

Learn more:

• Greater Auckland blog
• Infrastructure NZ Transmission Gully report
• Marc Daalder's article in Newsroom
• NZTA's list of the 17 roads of national significance

Find The Detail on Newsroom or RNZ

Go to this episode on rnz.co.nz for more details