A 19-year-old driver in a Honda Accord rear-ended a F-250 pickup truck on Clearwater Avenue in Kennewick, just before 2 p.m. Wednesday.
The female teenager was knocked unconscious, said Kennewick police Officer Aaron Hamel. She was helped out of the car by nearby business employees.
Two people were in the pickup and the female passenger was being taken to the hospital, Hamel said.
Both cars were driving west on Clearwater, Hamel said. The pickup was stopped for traffic when the Honda hit it.
The crash happened in front of the Round Table Pizza.