The Easter holiday road toll remains at zero, however an elderly man died of a pre-existing medical condition following a crash in Auckland.
Police said the man, aged in his 80s, was taken to hospital after he was critically injured in a crash in Glen Innes early Saturday morning.
The man's car was seen to veer of the road and then roll after striking a wall on Elstree Ave.
Police suspected a medical condition contributed to his losing control of the vehicle.
This afternoon the coroner ruled his death was the result of a heart attack.
The man was the sole occupant of the car, and no other people were involved in the crash.
Two serious crashes overnight
A man was seriously injured after the car he was in crashed through a fence and flipped upside down in Manurewa in South Auckland this morning.
The crash occurred on Great South Rd and Mahia Road at about 1.20am.
The car was found upside down and the man had to be cut from the car by the Fire Service.
Ambulance officers did not think the man's injuries were life threatening, but they were serious.
Police confirmed the driver was intoxicated.
In a separate incident, a man in his thirties also has serious injuries after his vehicle hit a fence in the Waikato town of Arapuni about 2.50am.
He was taken to Waikato Hospital.
Lower number of crashes
Last Easter weekend five people died on New Zealand's roads.
Acting National Road Policing Manager Rob Morgan says police have attended fewer traffic incidents overall this Easter.
By last evening they had dealt with 230 crashes compared with 254 at the same stage last Easter.