I WAS DRIVING IN AN URBAN AREA, ON A CITY STREET, AND THE CAR AHEAD OF ME WAS MAKING A RIGHT TURN. AS MY VEHICLE WAS SLOWING, I COVERED THE BRAKE PEDAL IN ANTICIPATION OF THE POSSIBILITY OF THE NEED TO BRAKE. THE CAR IN FRONT OF ME WAS JUST ABOUT CLEAR AND THERE WAS STILL PLENTY OF DISTANCE BETWEEN US. AT THAT TIME, THE SMART CITY BRAKE SUPPORT ENGAGED AND BROUGHT MY CAR TO A VIOLENT STOP. I FELT IMMEDIATE PAIN IN 2 LOCATIONS OF MY BACK, DUE TO THE JOLT. THERE WAS NOT AN IMPENDING ACCIDENT. IT WASN'T EVEN CLOSE.