The investigator said the Serious Crash Unit was now in talks with the four men who survived the crash to understand what went wrong.
Both lanes of Kaimaumau Rd were blocked after the fatal crash but were reopened a few hours later.
Bunn advised road users to “take care” while driving after the death marked the fourth fatality in the region in February, two more than last year.
It’s also the second fatal crash in Northland in less than 24 hours after a man died when his car failed to make a corner and hit a culvert while driving on a remote road in Moerewa.
On Monday, a truckie died after crashing into trees on State Highway 15. And another 35-year-old pedestrian died after being hit by a vehicle in Matauri Bay in the Far North.
The latest fatality takes the road toll to 10 in Northland this year.
Avneesh Vincent is the crime and emergency services reporter at the Advocate. He was previously at the Gisborne Herald as the arts and environment reporter and is passionate about covering stories that can make a difference. He joined NZME in July 2023.