VEHICLE BEGAN TO ACCELERATE DOWN A STEEP HILL AND NO MATTER WHAT I TRIED TO DO TO STOP THE VEHICLE NOTHING HAPPENED. IT JUST KEPT ACCELERATING. LOST CONTROL OF VEHICLE, AND WAS UNABLE TO NEGOTIATE THE RIGHT HAND TURN. VEHICLE SLAMMED INTO A DIRT EMBANKMENT, THEN ROLLED OVER AND REVERSED IT'S POSITION. CONSEQUENTLY, I WAS TRAPPED IN A RUNNING VEHICLE WITH GASOLINE LEAKING AND UNABLE TO SHUT OFF THE ENGINE. HAD TO WAIT 30N MINUTES FOR EMS/FIRE RESCUE TO ARRIVE. EXTRICATION TOOK ANOTHER 25-30 MINUTES. TRANSPORTED TO TRAUMA CENTER, YORK, PA.