WHILE DRIVING, MY CAR STARTED TO MAKE A BEEPING SOUND I HAD NOT HEARD BEFORE. I LOOKED AT THE DASHBOARD AND THE MULTI-MEDIA SYSTEM AND I DID NOT SEE ANY WARNING INDICATORS/LIGHTS. WHEN I STOPPED AT A RED LIGHT I PUT THE CAR IN PARK, TURNED THE CAR OFF AND TURNED THE CAR BACK ON (PUSH TO START). I PROCEEDED TO DRIVE AGAIN AND THE CAR BEGAN TO BEEP THAT UNFAMILIAR SOUND AGAIN. STILL NO VISIBLE WARNING INDICATORS/LIGHTS. I PULLED OVER, PUT THE PARKING BREAK ON, PUT THE CAR IN PARK, TURNED THE CAR OFF AND THEN TURNED THE CAR BACK ON. I BEGAN TO DRIVE AGAIN AND THE CAR WAS NO LONGER BEEPING. WHILE DRIVING I STEPPED ON THE BREAK PEDAL WITH THE INTENT TO SLOW DOWN BECAUSE OF SLOWING TRAFFIC, MY CAR DID NOT SLOW DOWN. I SLAMMED ON THE BREAK, THE CAR STILL DID NOT SLOW DOWN AND I HIT THE CAR IN FRONT OF ME. AFTER I HIT THE CAR IN FRONT OF ME MY CAR WAS STILL PUSHING, I STEPPED ON THE BREAK AGAIN AND THE CAR FELT AS IF IT WAS STILL TRYING TO PUSH FORWARD, I PULLED THE EMERGENCY BREAK AND THE CAR STOPPED. A POLICE OFFICER WAS ALREADY ON THE SCENE, THEN NOTIFIED US PARK POLICE TO COME AND TAKE A REPORT.