I HAD COME FROM A RED LIGHT THAT TURNED GREEN, AND AS I APPROACHED THE NEXT RED LIGHT, IT HAD TURNED GREEN BEFORE I GOT THERE. I WAS COASTING IN SLOWLY AS THE VEHICLES THAT WERE ALREADY WAITING AT THAT LIGHT WERE STARTING TO MOVE FORWARD. THOUGH THE LIGHT WAS GREEN, THE VEHICLE IN FRONT OF ME HAD STOPPED RIGHT AS HE GOT TO THE INTERSECTION - HE WAS PROACTIVE IN STOPPING FOR AN AMBULANCE THAT WAS LEAVING THE STATION AT THE CORNER (IT WAS NOT ON THE STREET YET AND NO SIRENS.) I WENT TO SLOW DOWN BEFORE REALIZING HE WAS ACTUALLY STOPPED (AT THAT MOMENT, WAS UNAWARE OF AN AMBULANCE.) WHEN I REALIZED HE WAS ACTUALLY STOPPED, I STILL HAD PLENTY OF TIME TO STOP THE DISTANCE I WAS FROM HIS CAR AHEAD OF ME, BUT MY CAR WOULD NOT STOP! THE CAR SLOWED DOWN SIGNIFICANTLY, HOWEVER, IT WOULD NOT STOP. IT JUST KEPT ROLLING FORWARD AT A VERY SLOW PACE. I REMEMBER PRESSING THE BRAKE HARDER, AND THE ABS KICKED IN, AND I HEARD THE "CRUNCH" SOUND 3 TIMES, EVEN THOUGH THE GROUND WAS DRY, AT THE TIME I DID NOT KNOW WHY, I THOUGHT SOMETHING WAS WRONG WITH THE ABS, BUT THE CAR NEVER STOPPED. ALL I COULD DO WAS WATCH IN VERY SLOW MOTION AS MY CAR CONTINUED TO PULL FORWARD AND I EVENTUALLY DRIFTED INTO THE REAR OF THE CAR IN FRONT OF ME. IT WAS A VERY SLOW-MOVING INCIDENT BUT I FELT TOTALLY HELPLESS AS THE CAR CONTINUED TO ROLL. THERE WAS NO DAMAGE TO HIS VEHICLE, ONLY TO MINE. I WAS UPSET BC I KEPT REPLAYING THE INCIDENT IN MY MIND: WHY DIDN'T MY CAR STOP? WHY DID IT FEEL LIKE IT WAS BEING