AS THE VEHICLE SELF DRIVING SYSTEM WAS ACTIVE IT CAME TO A FULL STOP IN A RED LIGHT. THE VEHICLE STOPPED BEHIND AN 18 WHEELER. AS I WAS IN A FULL STOP, I STOPPED LOOKING TO THE FRONT OF THE CAR AND LOOKED FOR A DOCUMENT AND CHECKED MESSAGES. SUDDENLY THE VEHICLE ACCELERATED FULLY, IMPACTING THE 18 WHEELER IN FRONT OF ME. MY REACTION WAS NOT FAST ENOUGH AS I WAS VERY CONFUSED, EVENTUALLY I HIT THE BREAKS AND ACTIVATED ABS SYSTEM BUT NOT WITH ENOUGH TIME TO STOP BEFORE IMPACT. THIS HAS BEEN CONFIRMED BY THE TESLA REPORT THAT THE VEHICLE ACCELERATION OCCURRED WITH OUT DRIVE INPUT. THEY SEEM TO IGNORE THE FACT THAT I WAS AT A RED LIGHT AND STATE IT IS OPERATOR ERROR NOT TO BE ATTENTIVE, BUT REGARDLESS, ACCELERATING AT FULL SPEED WITH NO INPUT TOWARDS ANOTHER VEHICLE IS A HAZARD TO THE POPULATION. THEY HAVE NOT SHARED THE REPORT FROM ENGINEERING, ONLY READ THE STATEMENT OVER THE PHONE ONCE AND HAVE NOT BEEN ABLE TO ASK FOR THE WRITTEN REPORT. SIGNIFICANT AVOIDANCE IN OCCURRING FROM THE COMPANY.