A Panmure car yard fire is under control but traffic is backing up as firefighters continue to clean up the site.
A witness said the fire had broken out at DNA Motors on the corner of Ireland Rd and Lagoon Drive.
The road had been closed off at the roundabout.
"From Pakuranga heading to town it's causing a backlog of traffic, heaps of rubberneckers stopping to see what's going on," he said.
A Fire and Emergency spokesman said they were called to the fire at 7.03am and two fire engines attended.