ON 05/25/2016 AT ABOUT 9AM, WHILE IN MOTION AT A RATE OF SPEED APPROX 25 MPH ON A STREET DURING CONSTRUCTION (DON'T KNOW IF THE BUMPY ROAD HAD ANYTHING TO DO WITH IT), THE CHANGE OIL SOON LIGHT APPEARED AND SECONDS LATER ALL THE LIGHTS ON THE DASH CAME ON WITH THE MESSAGE TO CHECK THE "CHECK HYBRID SYSTEM" . I TRIED TO STOP THE VEHICLE AND IT KEPT ACCELERATING. I PRESSED ON THE BREAKS REALLY HARD AND THE TRACTION CONTROL LIGHT KEPT FLASHING ON AND OFF LIKE CRAZY BUT IT BARELY HAD ANY IMPACT. ALTHOUGH THE VEHICLE SLOWED, IT DID NOT COME TO A FULL STOP. I ENDED UP HITTING THE VEHICLE IN FRONT OF ME. THANK GOD IT WAS A TRUCK AND AS ABLE TO STOP THE CAR FROM MOVING FURTHER OR I COULD OF ENDED UP IN THE MIDDLE OF AN INTERSECTION. AFTER THE COLLISION, THE CAR WOULD NOT STOP ALTHOUGH THE PARK BUTTON WAS PRESSED AND LIGHT WAS ON. I EVEN TRIED TURNING OFF THE VEHICLE AND THE VEHICLE STAYED ON AND IN DRIVE. I ENDED UP IN THE HOSPITAL AND DON'T KNOW HOW IT EVENTUALLY GOT TURNED OFF BUT THAT WAS VERY FRIGHTENING. I HAD MY CHILDREN IN THE CAR. ON IMPACT, THE SEAT BELTS DID NOT EVEN TIGHTEN.