The two right lanes of southbound Interstate 405 were closed on Tuesday afternoon for around 80 minutes near state Route 527 after a semi truck rear-ended a Honda Fiat.
The force of the collision pushed the Honda underneath a Chevrolet pickup truck. Both vehicles were stopped in traffic.
The Washington State Patrol said the occupants of the Honda suffered minor injuries.
The crash was caused by the semi truck driver not paying attention, the State Patrol said.