Automatic Transmission problems of the 1999 Buick Regal

I am in army & while driving to work one morning at 5:30 am my van slowly started accelerating the more I pressed the brake the faster the van went, by the time I reached the street the van was up to 50 mph I was afraid so I call my husband, told him the situation & the street I was traveling, he was on the way. By then I was up to 60-65 mph, I called 911 stated the situation, asking for help & to have someone on the phone just in case. I almost hit a bus, looking ahead a few blocks I saw back-to-back traffic starting to build-up, I did not want to hurt myself or anyone else, then going 65-70 mph I looked over and saw a park I turned the van into the park & to stop it I decided to crushed the van into a tree. I turned toward the tree and jumped out; the van crashed into the side of the tree & continued to keep going. I ran after it as I saw the van jump the curb and going 70mph towards the row of homes across the street crashed into a tree head on. The van engine after all that continued to roar as if trying to keep going. I flagged down a van and recalled the police to let them know where the van had stopped. When the fire department came & turned the van off they told me the van was on fire & they towed it away. This is a blessing know one was hurt, but something needs to be done about this, & for the auto company not to investigate is a tragedy. What are they saying numerous people will have to die, before they will admit there maybe a problem, just to save money? if that is the case shame on them. I am here by grace, but I can't help but to think of those this same situation may have happen to, but did not live to say why or how it happen. If this is what is happening god bless the roads we drive on that the next person my not think to do what I did & the live it will affect. Thank you, for letting me post my story.

The vehicle in question is a 1999 Buick Regal lse with 63,000 miles. Regular maintenance has been performed in a timely manner. When backing out of a parking spot with the car in reverse and foot lightly on the brake, it felt as though I had bumped into another car or that my wheel had slipped into a pot hole. Upon examination, nothing was hit by the body of the car or the wheels. This happened one time and then one time a month later. Two days after that, the incident repeated itself, and the vehicle would not move in reverse when idling unless I pressed on the gas hard. After taking the vehicle to a Buick dealership for diagnosis, I had the transmission replaced.