Been driving my i3 problem free for a year. This morning pulling away from a parking area with soft touch on the power pedal to cross the pavement area the car took over and shot off at full speed across the road smashed into a sign post and was flung into adjoining main traffic route. Fortunately no passing traffic or pedestrians. This was not a case of selecting drive rather than reverse neither was it by having foot on wrong pedal. My foot was on the accelerator pedal lightly pressing and watching for any cross passing traffic. I had absolutely no control - the car "took over at full revs". Front nearside,wheel etc demolished. Could so easily have killed or been killed. How can this be explained ? How do I prevent this from happening again. I see there are a few similar occurances posted online. I would appreciate information from anyone who has experienced similar.