I drove our ID4 to pick up a neighbor's son from school. Using the regenerative braking mode, I came to a stop on a side street, just beyond a school crossing where middle school kids were everywhere, at which time the car lunged forward at a high rate of speed while my foot was still on the brake. Luckily we ran into a parked service van that slowed our progress while I put the car in the parking mode, which finally stopped the car. We both experienced the hard impact of hitting the truck and noticed that the air bags did not deploy. There are skid marks that confirm that the brakes were employed while the car moved independently. We are grateful we didn't hit anyone. I will not drive this car again. There were no indications that anything we amiss prior to this malfunction. Our insurance adjustor will be coming by in the next day or two to inspect the car. This could have been a tragic event!!!!!