A truck has rolled and is blocking a lane at the intersection of State Highway 2 and 27 in Mangatarata, south-east of Auckland.
A police spokesperson said the truck tipped on its side around 8:30 this morning and is blocking the westbound lane.
The driver received moderate injuries and is being taken to Thames Hospital.
Police advise there may be delays while the crash is being cleared.
Fire Service spokesman Jarron Phillips confirmed two fire trucks from Ngatea station attended.
NZ Transport Agency said delays in the area are possible.