A fire has completely destroyed the cab of a grain feed truck on Auckland's Southern Motorway.

The blaze happened just north of the Drury interchange, with the first 111 call to the fire service coming at 9.12am.

The cab of the MainFeeds truck-and-trailer had been completely ablaze but the driver escaped unharmed, Fire and Emergency NZ northern shift manager Scott Osmond said.

Four fire appliances and a tanker were sent to the fire, Osmond said. He predicted "horrendous" traffic delays, with both lanes northbound blocked as 20 firefighters battled the blaze.

Advertisement

The truck has now been cleared of the motorway lanes and traffic is flowing well.

Heavy traffic congestion is building up near the scene of the truck fire. Photo / Will Trafford
Heavy traffic congestion is building up near the scene of the truck fire. Photo / Will Trafford
The charred aftermath of the MainFeeds truck.
The charred aftermath of the MainFeeds truck.
The burnt-out shell of the truck's cab/ Photo / Jason Oxenham
The burnt-out shell of the truck's cab/ Photo / Jason Oxenham