A woman who witnessed a fatal motorbike crash on the Wellington motorway on Sunday says speed and risky passing were to blame for the accident, which left two people dead.
Jenny Sutton said she was three cars back from the crash when it happened.
"The motorbike passed me and a couple of other vehicles," she said.
"Speed, risky passing, then loss of control were factors in what occurred.
"The bike skirted along the median barrier for a time before those on it were thrown."
Ms Sutton said the bike was weaving through traffic, passing very close to other vehicles but she didn't think too much of it because "that's just bikes, you know".
Then she saw a cloud of dirt and a body on the road.
Ms Sutton said she thought people were very measured in their reaction to the crash and reacted quickly, calling 111 and providing medical assistance.
"I think people managed things quite well, people were onto it. Everyone did what they were supposed to do."
Ms Sutton said her thoughts were with the families of those who died.
The crash, which occurred shortly before 1pm on Sunday, caused Wellington traffic to grind to a halt as the Terrace tunnel had to be closed, blocking the main route in and out of the capital for more than three hours.
A man and a woman died at the scene.
