Two
of the tunnel's three lanes reopened before all lanes were cleared by 9.10am.
The New Zealand Transport Agency is still advising motorists to use the Northwestern Motorway to head to the North Shore.
Traffic quickly banked up on the highway and on key central city roads with lowered barrier arms bringing vehicles entering the tunnel to a halt.
The transport agency said there was significant delays heading north on SH1.
Fire and Emergency northern communications shift manager Paul Radden said the blaze was confined to the car's engine. Those inside the tunnel were evacuated to the emergency safety zone.
- More to come