Auckland's Southern Motorway has been partially closed at Manukau after a truck crashed into a number of lamp poles on the edge of the road, police say.
The crash happened near the Redoubt Rd off-ramp about 2.30pm.
The male driver was in a critical condition, police said.
The cause of the crash would be investigated by the police serious crash unit.
The left lane of the motorway was closed until the scene was cleared, police said.
