The woman who fell from a moving campervan on the Waikato Expressway on Thursday remains in a critical condition.
The 59-year-old remains in Waikato Hospital's Intensive Care Unit after she was hurt trying to close a door when the wind blew it open and caused her to fall.
Waikato police Senior Seargeant Rupert Friend said a couple were travelling south on State Highway 1 when the woman sustained her injuries.
"A female passenger in a caravan has tried to fix a door that wasn't quite closed properly and has ended up being injured as a result of those activities," he said.
The woman's husband was driving at the time. She suffered significant grazing and cuts as she skidded along the highway.