A crash blocked all lanes on westbound Interstate 370 before Interstate 270 in Gaithersburg, Maryland, during the Thursday evening rush.
Video from Chopper4 showed major traffic delays on both sides of I-370. Westbound traffic was at a complete standstill as police diverted drivers to the eastbound lanes near the scene of the crash. Traffic was later diverted to Shady Grove Road, WTOP reported.
All lanes were reopened hours after the crash.
Maryland State Police said a car and motorcycle collided. Both vehicles ended up yards away from the interstate and in the woods.
One person was taken to a hospital with life-threatening injuries.
No further information was immediately available.
Stay with News4 and NBCWashington.com for updates.