VEH. WAS TRAVELING AT APPROX. 25MPH UP A LOW INCLINE ON SLUSHY PAVED 2 LANE SURFACE. VEH. BROKE TRACTION SPUN SIDEWAYS AND TRAVELLED SIDEWAYS INTO BRUSH AND STRIKING A TREE IN THE DRIVER. SIDE FRONT FENDER (SIDE IMPACT). DRIVERS HEAD STRUCK AND BROKE DRVRS. DOOR WINDOW. DRVR. SUSTAINED SEVERAL FACIAL LACERATIONS REQUIRING PLASTIC SURGERY AND RESULTING IN PROBABLE SCARRING. FRONT SEAT PASSENGER SUSTAINED RIGHT LEG INJURY RESULTING IN SEVERE BRUISING AND SWELLING. BOTH WERE TREATED IN AN EMERGENCY ROOM AND RELEASED. VEH. IS EQUIPPED WITH SIDE CURTAIN AIRBAGS WHICH DID NOT DEPLOY. IF DEPLOYED, THE DRVR. SIDE AIRBAG WOULD HAVE PREVENTED THE DRVRS. INJURIES. *TR