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Emergency services responded to the serious crash about 1pm on Friday, a police spokesperson said.
Three people were injured. One person is in a critical condition. There were three people in the car at the time of the crash but no passengers on the bus.
A St John spokesperson said two helicopters were dispatched to the scene.
Ambulance staff treated one person in a critical condition and two others with moderate and minor injuries.
SH1 was initially closed near the intersection of Penny Lane, north of Waipapa Bay, but reopened about 5pm, a Waka Kotahi NZ Transport Agency spokesperson said.
"Expect delays of up to 15 minutes as congestion eases through the area."
The serious crash unit is investigating.