A pedestrian suffered critical injuries when she was struck by a vehicle Thursday afternoon just outside Woodside High School, a California Highway Patrol officer said.

At around 3:30 p.m., a silver Honda Fit was traveling east on Woodside Road (Highway 84) when it struck another vehicle near Churchill Avenue and went onto the gravel shoulder, where it hit a woman in her mid 50s, CHP Officer Art Montiel said.

The woman suffered head trauma and was unresponsive when she was taken to Stanford Hospital, Officer Montiel said.

The driver of the Honda went to Stanford Hospital with lower back pain.

CHP officers said they don't know yet why the Honda driver went off the road.