The second car crashed through a fence and into a vacant section.
Two other teenagers, aged 16 and 19, were flown to Waikato Hospital with serious injuries sustained in the crash but were reported to be in a stable condition yesterday afternoon.
Four other youths sustained moderate injuries and were treated at Thames Hospital.
Sandra Clark, 43, was killed yesterday when her four-wheel drive vehicle skidded on a gravel road into a ditch near Rangitaiki, 50km southeast of Taupo. She was not wearing a seatbelt and was thrown through the windscreen. The woman was found at 9am by a passing motorist.
Taupo police said Clark would almost certainly have survived if she had buckled up.
Meanwhile, two 15-year-old boys were killed after the high-powered Ford Falcon they were in went out of control and hit a tree while passing another car in South Auckland on Friday night. The car burst into flames on impact.
One teenager died at the scene and the second died a short time later at Middlemore Hospital.
Crash analyst Paul Simcox, of Counties Manukau police, says the car the two boys were in clipped another vehicle when overtaking.
Three other passengers, one from the Ford and one from the clipped car, are recovering from moderate injuries.
A 42-year-old Levin man died when his motorcycle collided with another vehicle on the Kapiti Coast around 4pm on Friday.
He was travelling north on Paekakariki Hill Rd when he collided with a southbound vehicle then hit a bank. His name is yet to be released.
