WHILE SLOWING FOR UPCOMING TRAFFIC I SIGNALED TO THE GMC DUALLY TRUCK BY TAPPING MY BRAKES...HE WAS TALKING TO HIS PASSENGER AND DIDN'T SEE ME...HE HI ME AT ABOUT 55 MPH...THE IMPACT PUSHED ME INTO ONCOMING TRAFFIC SPINNING ME AROUND 3 TIMES...THE DRIVERS SEATBACK BROKE AND INSTEAD OF KEEPING ME IN MY SEAT (I WAS SEATBELTED) I ENDED UP IN THE RIGHT REAR BACK SEAT SLAMMING MY HEAD AGAINST THE RIGHT READ DOOR AND ALSO HURT MY BACK...I DON'T THINK THE SEAT IS SAFE IF IT DID THAT. *TR