Transport Minister Gerry Brownlee has signalled Wellington's planned $1 billion Transmission Gully project would be "ideal for a Public Private Partnership".
Brownlee has asked the NZTA to report to him on options for funding the planned 27km link between MacKay's Crossing and Linden, which will provide a more direct route for getting out of the capital on State Highway 1.
"Transmission Gully is consented so it can move forward much more quickly and is ideal for a PPP," Brownlee told the Herald.
"I've asked NZTA to investigate and they are putting together some big documents and I expect them to come back probably in October."
In June, an independent board of inquiry granted consent for the new inland highway, which will shave considerable time from peak-time journeys between Kapiti and Wellington. NZTA expects to begin construction in 2015 and complete it by 2021.