At approx. 2000 hours, Co's.31 and 23 along with RS3 were dispatched for an auto accident in the area of I270 NBL just South of Route 85. As units marked up Emergency Communications reported recieving multiple calls that the person was trapped in the vehicle and a medic was added to the call. C3-2 arrived and confirmed location and reported single vehicle into guradrail with one trapped, C3-2 established " I 270 Command". Command reported one Pri.2 Cat.B trauma patient and requested aviation, RS3 arrived and stabilized the vehicle, once this was completed the crew removed the rear driver's door and B post for access to the patient. The extriaction was completed in less than 5 minutes and the patient was loaded into A238 for treatment until the arrival of Trooper 3, E311 had a protection line in place and handled the LZ, Command placed E231 and D-23 in service. Command was terminated and units were placed in service, the patient was transported to Baltimore Shock Trauma for treatment and the scene was turned over to MSP for investigation.