A rock fall which smashed into a car, killing an elderly passenger, shunted the vehicle about 20m along the road.
The 76-year-old woman from New Plymouth was on her way to a reunion in Waihi with her sister when the pair's hatchback car was struck by falling rocks on State Highway 3, near Waitomo yesterday.
Piopio Fire Station officer Tama Williams said: "The rocks hit the bottom [of the cliff] and bounced out on to the road. [They] struck the car on the side."
They fell from a bluff about 30m above the road, Mr Williams said.
Emergency workers found the car had been shunted down the road.