I WAS TRAVELING ON A TWO LANE ROAD IN MY 2014 MITSUBISHI MIRAGE, IT HAD BEEN RAINING AND THE ROADS WERE STILL DAMP. I WAS DRIVING BELOW THE SPEED LIMIT BECAUSE I WANTED TO ATTEMPT TO GET THE HIGHEST MPG POSSIBLE ON THE MPG CALCULATOR ON THE DASH. SUDDENLY, THE TRUCK IN FRONT OF ME SLAMMED ON BREAKS. IT WAS AT A DISTANCE THAT I SHOULD HAVE NOT BEEN WORRIED ABOUT COLLISION, BUT AS SOON AS I HIT THE BREAKS IN RESPONSE, THEY FAILED. EVERYTHING HAPPENED SO FAST I DON'T KNOW IF MY BRAKES LOCKED UP CAUSING ME TO SLIDE, OR IF THEY JUST DID NOT ACTIVATE AT ALL. THERE WERE NO SKID MARKS ON THE ROAD. I ENDED UP GOING INTO ONCOMING TRAFFIC AND HITTING ANOTHER VEHICLE HEAD ON. THE IMPACT FLIPPED MY MIRAGE MULTIPLE TIMES AND I LANDED SIDEWAYS IN A DITCH. ALL AIRBAGS DEPLOYED. THE DRIVER AND PASSENGER OF THE OTHER VEHICLE WERE INJURED AND WENT TO THE HOSPITAL. I BROKE A RIB AND RECEIVED SOME BAD BRUISING FROM AIRBAG AND SEATBELT, BUT REFUSED TO GO TO THE HOSPITAL.