I HAD DRIVEN INTO A LEFT TURN LANE TO PERFORM A LEFT TURN AND HAD WAITED FOR THE LIGHT TO TURN GREEN. WHEN THE LIGHT TURNED GREEN I STEPPED ON THE GAS AS USUAL AND THE CAR MOVED BACKWARDS INSTEAD OF FORWARDS. I IMMEDIATELY BRAKED BUT STILL HIT THE CAR BEHIND ME THAT WAS ALSO WAITING TO TURN LEFT. THE CAR BEHIND ME HAD NO VISIBLE DAMAGE BUT MY REAR BUMPER WAS PUSHED FORWARDS JUST ENOUGH THAT MY REAR LEFT PASSENGER DOOR CANNOT BE OPENED. *TR