The young male driver, and sole occupant, of a four-wheel-drive vehicle that crashed south of Okaihau on Saturday morning was apparently not using a seatbelt.
The man, who died at the scene, was thrown from the vehicle as it rolled three times after failing to take a corner at the end of a long straight on State Highway 1. It came to rest in a paddock some 150 metres from the highway.
Emergency services were called to the crash at a little after 7am.
The Serious Crash Unit is investigating, and police in Kaikohe (phone 09 405-2960) are keen to hear from anyone who was in the area at the time and might have any information.
Police have yet to release the name of the deceased.