The car was going at the speed limit or maybe 5-9 miles over speed limit when brakes were pumped to stop car as there was stop and go traffic on a bridge in bay area (CA). The car had quite a distance from the car in front of it. Despite brakes being applied, the car seemed to accelerate and brakes had to be applied hard. However, the car did not stop until it hit the honda in front of it. As the driver of the Telsa at the time of the accident, it seems as though car was accelerating despite brakes being applied. A huge sound was heard by me the driver and then the driver eat belt became malfunctioned and the car would not restart. After a few minutes, the car restarted but now the dash board states service needed and I could no longer fasten the seat belt. The front of the car appeared to have minimal bumper damage but the seat has not worked since the accident.