I WAS DRIVING DOWN A BUSY CITY STREET, GOING ABOUT 30 MPH. I NOTICED THE CAR IN FRONT OF ME WAS STOPPED FROM 100 FEET BACK AND I SLAMMED ON MY BRAKES. MY CAR DID NOT STOP, IT DID NOT SLOW DOWN AT ALL. THE WEATHER WAS WARM, THE ROAD WAS DRY AND IT WAS LIKE TRYING TO STOP ON AN ICY ROAD AND I REAR ENDED THE CAR IN FRONT OF ME. MY AIR BAGS DID NOT DEPLOY EITHER. THE OTHER CAR HAD MINIMAL DAMAGE TO HER BACK BUMPER. SHE WAS INJURED, I HAD MINOR WHIPLASH.