A 16-year-old girl was seriously injured in a single-vehicle accident along Highlands Drive Northeast in Issaquah at about 9 a.m. on Sunday.

According to a story posted on King5.com, police said the driver, who was the only occupant in the vehicle, was traveling southbound at a high rate of speed along Highlands Drive between Northeast Discovery Drive and Interstate 90.

She lost control of the vehicle, crossed all opposite traffic lanes and went over a guardrail into a wooded area.

The driver was transported to Harborview Medical Center with serious injuries.

Issaquah police are investigating the accident with assistance from the Washington State Patrol. It’s not yet known if alcohol or drugs were a factor in the crash.