I WAS STOPPED AT A LIGHT WITH MY R FOOT ON THE BREAK. SUDDENLY THE CAR WENT INTO AN UNCONTROLLED ACCELERATION. I COULD HEAR THE ENGINE REVVING. IN A FEW SECONDS, IT HIT THE CAR DIRECTLY IN FRONT OF ME AND STOPPED UPON IMPACT BUT IF THAT CAR HADN'T BEEN THERE I WOULD HAVE BEEN PROPELLED INTO A BUSY INTERSECTION WITH CROSSWAYS TRAFFIC. IT WAS LIKE A NIGHTMARE. THIS WAS AT A VERY BUSY CITY STREET INTERSECTION AT A BUSY TIME OF DAY (3 PM), ON THE ACCESS RD TO A MAJOR INTERSTATE HWY IN A LARGE METRO AREA. THE OTHER DRIVER AND VALET GUYS FROM A HOTEL ACROSS THE STREET WITNESSED I WAS EXTREMELY SHAKEN UP BUT ALERT AND IN MY RIGHT MIND, ETC.