Four people have died within hours and just as police reiterated safety messages emergency services headed to cut three critically injured people from another crash.
The latest crash is a head-on collision between two cars in Karangahake Gorge on Saturday afternoon.
Three people are critically injured and the Fire Service cut some of them from the wreckage, says a Trustpower TECT Rescue Helicopter spokesman.
Two patients were airlifted to Waikato Hospital and one was airlifted to Tauranga Hospital.
It was the second head-on crash in the gorge on Saturday. The road, State Highway 2, is closed.
Also, in Manawatu early on Saturday morning a 23-year-old man died after being thrown from his car on a bend near the Ohakea air base.
He died at the scene and another person was taken to hospital in a critical condition.
A 51-year-old motorcyclist died in hospital after crashing in New Plymouth. He had lost control on Centennial Drive about 9pm on Friday.
Two men also died in a head-on crash west of Hamilton on Friday night.
Police are investigating what caused the crashes and no names have been released.
National road policing manager, Superintendent Steve Greally, said it was an incredibly sad and frustrating start to the Waitangi Day holiday weekend.
"It's tragic for those families who are now dealing with the grief and aftermath of a road death," he says.
He's urging people to drive to weather conditions, check their speed, avoid alcohol, take rest breaks and wear seatbelts.