Drivers are being urged to take care on the road between Whangārei and Auckland from Friday as 800 extra truck trips begin to move freight.
The convoy will ferry 1200 containers of Christmas cargo from Northport, south along State Highway 1.
The cargo is from the ship Constantinos P, which was diverted to Northport because of delays in unloading in Auckland.
David Aitken is the chief executive of the National Road Carriers Association.
