I drive in the standard one pedal driving mode which allows for the car to brake and come to a complete stop using the regen system by simply releasing the accelerator. The issue is that I had come to a stop behind another car at traffic lights with my foot of the accelerator. In one pedal driving there is no need to hold the brake pedal as the car should so this itself. After a few seconds of being stationary the car, without me touching the accelerator, left forward and started to drive on itself. I was able to stop this by applying the brake before I hit the car in front. The car should not have done this.