I slowed down to turn into my daughter's driveway and park in front of their boat (maybe 5 mph if that). Suddenly, the vehicle accelerated at a high rate of speed on its own. I hit the brakes with no response. I had to veer to the left of the driveway onto the grass to avoid hitting the boat and garage. The car continued to accelerate (approximately 60-70+ mph) as I tried pumping the break pedal several times with no response (went to floor board with no resistance). I had to maneuver a narrow area at a high rate of speed to avoid hitting the house to my right and trees to my left. As I came down the hill, I approached a large embankment of a knocked over tree, dirt and brush pile. I knew I had to do something or it would be a serious impact. I quickly swerved to my right. I didn't know there was a ditch to the right of this embankment, but thankfully it brought my vehicle to a stop as my front left tire became flat and stuck in the dirt This was very shocking and traumatizing. We verified there was nothing on the floor that would have caused the gas to be accelerated. My car is currently on 3 wheels where it stopped (1 wheel suspended in the air). I received medical care at the ER for back pain. A CT scan showed I had a T12 Vertebrae compression fracture. I was prescribed a back brace, pain medication and an anti-inflammatory. I have also been alternating with a heat pad and ice pack, plus using a cane to help me get around. I will be contacting Toyota as well for an inv