As I was trying to make a turn on a street which I have used for months, the vehicle started accelerating on its own. So much so that it laterally flew over a median curb and hit another vehicle. I could not steer the vehicle nor stop it despite the fact that I hit the breaks several times. It truly was a very scary experience, and I am not sure what caused it. I have read of similar issues in the past, but I never thought that this truly happens. As a result of the acceleration, I got into an accident that damaged four vehicles. I am a very good and confident driver with clean driving record, and I have no explanation as to what happened, other than that the vehicle took control on its own. There were no warning lamps before, the vehicle has not been inspected yet, but I assume it will be after I have reported this very issue to the insurance company. While I am fine, my safety and the safety of those who were involved in the accident could have been extremely in danger.