A MEDICAL incident is the most likely cause of West Ulverstone's double fatality on Sunday.
Police Inspector Shane Lefevre said an early indication suggested the driver might have lost consciousness and there was an increase in the acceleration of the vehicle.
Two of the three women travelling east on South Road in a gold- coloured Nissan Tiida died at the scene after the car rolled several times and ploughed into a hardware store's brick display wall.
About 3pm on Sunday the car crossed over the cement median strip at the junction of Hobbs Parade and Queen Street, hitting a pedestrian, a 63-year-old man from Ulverstone.
The three women in the car were all from Ulverstone.
The driver, a 65-year-old woman, and the 81-year-old rear passenger were declared dead at the scene.
The front-seat passenger, an 83-year-old woman who sustained multiple fractures and non-life- threatening injuries, was transported to the North-West Regional Hospital.
Her condition was yesterday upgraded to stable.
The pedestrian sustained leg injuries.
Inspector Lefevre said the investigation was still in its early stages.
"We do believe there may have been a medical incident that happened with the driver and that's contributed to the accident and is what has caused the vehicle to cross the median strip and unfortunately hit a pedestrian at the same time," he said.
Weather may be factored into the crash.
"I certainly think that the weather may have had some influence on the crash itself, particularly at the end point of the crash, but once again we are still investigating," he said.
Inspector Lefevre said police had spoken with the surviving woman but did not know where the vehicle was heading.
He said police were still seeking witnesses to the crash.