Putting a rail crossing under Auckland Harbour - rather than a road tunnel - could save billions of dollars, says the Green Party.
Photo: 123RF
The government has begun planning for a second harbour crossing but it is working towards a road-only tunnel.
The Greens today launched a campaign to make a rail crossing the priority.
Transport spokesperson Julie Anne Genter said it would be more cost-effective and a road-only crossing would be a massive missed opportunity.