Cruise Control problems of the 1999 Toyota 4Runner

At the time of the accident, I was driving 70mph on a major highway attempting to switch lanes when the car lost complete control. The car swerved severely left and there was no functioning of the brakes or steering. I was then hit driver side by a semi-tractor trailor who knocked me into a concrete wall. The car was demolished. The mechanical expert report showed that the throttle was open and it appeared that the cruise control had caused the car to accellerate although the cruise control was not turned on at the time. My concerns relate to the inability to steer the car or initiate the brakes if it was in fact a tire blow-out and also I am concerned at to why the throttle was open when the cruise control was not on. Immediately prior to the accident, I felt as though the car was accellerating independently of my utilizing the gas pedal. In conclusion, I am not certain as to what caused the car to go out of control, however, if it was a tire blow-out, I think that it was unbelievably unsafe to not be( dot number: ).