Let's be clear now, the last government didn't "approve the project", it just approved millions to investigate and design it.
Perhaps it is time for a cold hard look at the economics. Unfortunately, Labour also merged the agency responsible for highways with the agency responsible for funding decisions on highways, so you might ask yourself how the NZ Transport Agency can realistically carry out this task.
Anyway Stephen, in case you haven't read it, here's a link to most of my thoughts.
Oh by the way, you might have noticed the accident rate on the current road isn't an issue anymore, and the congestion at Paremata has gone - the worst congestion is through Kapiti, north of where Transmission Gully would be. Oh and Pukerua Bay? A bypass could rather quickly fix that issue.
UPDATE: Oops forgot the link, now it's there.