BFD responded shortly before midnight to a reported motor vehicle accident. While en route pd updated that there will be an extrication required of one patient. On arrival two vehicles were found. A pick up truck was flipped onto its roof resting on a guard rail. A second vehicle that was struck head on by the pickup had heavy drivers side damage with the driver pinned inside the vehicle. Crews went to work removing the driver side doors and lifting the dash off the patients legs. Extrication was completed in approximately 20 min. All (4) of the occupants for both vehicles were transported to Danbury Hospital by Newtown Ambulance.