Shifted the operating car from park to drive when the car suddenly and unexpectedly took off even though I was not touching the accelerator. The car accelerated across the street and slammed into a parked car. The airbags did not deploy which would indicate a low-speed but the pre-collision system did not stop the car which would indicate higher- speed. My car was written off as a complete loss by my insurance carrier and the damage to the parked car that was hit was extensive.