Kent Fire and Rescue Service was called to reports of a crash involving two lorries and a truck on the M20 London-bound, near to Junction 8 for Hollingbourne, Maidstone.
Four fire engines and the Technical Rescue Unit were sent to the scene. Fire crews used cutting equipment to release one casualty, who was passed into the care of paramedics. SECAmb, Kent Police and Kent Sussex and Surrey air ambulance also attended.
The section of the M20 still remains closed following the collision.
The coastbound carriage was reopened just after 4.30pm.