I put my car in Drive after I got the green light to exit the car wash and the car surged forward and continued accelerating, knocking over several installations and going over a median separating the car wash from the roadway. The car ended up on the roadway, finally slowed down by multiple collisions and I was able to get control of it and get it parked and wait for the police to come. By some miracle, no-one was hurt, but the car was completely out of control. It just wouldn't stop or slow down. It was the most bizarre experience I have ever had and I fear it will not or cannot be investigated. I have informed my insurance company and my hope is that they can find something showing that the car malfunctioned.