UPDATE: The scene was cleared and the interstate reopened to traffic by 4:45pm.
PREVIOUS: Four lanes of northbound Interstate 5 were blocked in Federal Way after a collision involving multiple vehicles, according to the Washington State Department of Transportation.
According to the Washington State Patrol, a parked WSDOT attenuator truck on the shoulder near a guardrail was hit by a vehicle that may have drifted onto the shoulder, then hit two more vehicles…