FREMONT -- A woman was critically injured Tuesday afternoon after she crashed her car into a eucalyptus tree after driving off Interstate 880, a fire official said.
The woman, whose name was not released, was driving southbound on I-880 at 4:13 p.m. when she crashed into the tree, south of Mowry Avenue, Fremont Fire Battalion Chief Steve Silva said.
No one else was injured and no other vehicles were involved, authorities said.
Hanna Yi, a 31-year-old Fremont woman who witnessed the accident, said before the woman lost control of her car she had started to veer to the right to change lanes but was possibly startled by a Maxima that had just moved into the lane.
She jerked the wheel back to the left, Yi said.
"Her car suddenly violently jerked from left to right a few times before she completely lost control of her car," said Yi, who slowed down along with other drivers as the collision unfolded.
Yi said the woman's car spun into oncoming traffic, slid across the two right lanes and then hit the tree.
Fire crews arrived and found the woman trapped inside her vehicle, and worked for 20 minutes to get her out of the car.
The woman was taken to San Jose Regional Medical Center, where she was in critical condition on Wednesday, Silva said.
The cause of the crash is under investigation.