CAR IN FRONT SLOWED THEN STOPPED QUICKLY AS THE CAR AHEAD OF IT ATTEMPTED TO USE THE MIDDLE LANE IMPROPERLY (NOT A TURN LANE AT THAT TIME), NOT MOVING FULLY NOR QUICKLY INTO THE LANE. CAR IN FRONT STOPPED. APPLIED BRAKES IMMEDIATELY TO THE PRIUS C TO SLOW, THEN ADDED ONE RAPID PUMP, AND ULTIMATELY PUSHED THE PEDAL TO THE FLOOR. THE PRIUS DID LITTLE MORE THAN SLOW (WITHOUT EVEN A JOLT FROM THE FIRM APPLICATION OF THE BRAKES), CAUSING A CRASH INTO THE REAR OF THE CAR IN FRONT AND SIGNIFICANT DAMAGE TO THE ENTIRE FRONT END. NO AIRBAG DEPLOYMENT. *JS