Emergency services were not initially able to identify the man and he was estimated to be between the age of 17 and 22.
Further inquiries allowed police to confirm he had been identified and his family notified about 10.30am.
Western Bay of Plenty road policing manager Senior Sergeant Ian Campion said the man sustained serious head, chest and pelvic injuries. It was too early to determine how the collision took place as witnesses were still being spoken to.
The driver of the vehicle had been tested for alcohol and speed did not appear to have been a factor, he said.
Residents near the scene of the incident did not hear anything and only realised what had happened when they woke up to find police had blocked the Tauranga-bound lane outside their houses.
One resident reported hearing people arguing in the early hours of the morning but was unaware of any incident.
A neighbour said she woke to her phone ringing about 6am and noticed police lights flashing through her window. The road was always busy but drivers were generally well behaved, she said.
"You do put your foot down a bit but there are enough signs along there that say 60."
