Units responded to the inner loop of the Capital Beltway prior to the 270 split for the collision with one overturned. Cabin John Truck 710 arrived on the scene, confirmed the dispatch, and advised one patient was still in the vehicle. Command was established and the rescue squad and truck crews removed both sides of the vehicle for patient access and extrication. Care was transferred to the medic unit who transported the patient to a local trauma center. Units cleared the scene in roughly 30 minutes.