MY WIFE AND I WERE INVOLVED IN A HIT AND RUN INCIDENT WHILE TRAVELING SOUTHBOUND ON I-75 JUST SOUTH OF DELK ROAD IN MARIETTA GA. THE DRIVER OF THE OTHER CAR CAUSED US TO BEGIN A SERIES OF OVERSTEER CORRECTIONS WHICH ULTIMATELY LED TO THE CAR LOOSING COMPLETE TRACTION AND MAKING TWO COMPLETE REVOLUTIONS WHILE EXITING THE ROAD TOWARDS THE GRASS SHOULDER. WE EXITED THE ROAD GOING BACKWARDS AND PROCEEDED TO HIT A 6' DEEP CULVERT AND CAUSE THE CAR TO BECOME AIRBORNE. UPON THE INITIAL IMPACT MY WIFE'S SAFETY BELT WHICH HAD BEEN PROPERLY SECURED UNTIL THE IMPACT, RELEASED AND CAUSED HER TO COME OUT OF HER SEAT. AFTER LANDING AND THEN COMING TO REST VIOLENTLY I IMMEDIATELY CHECKED TO MAKE SURE SHE WAS ALRIGHT AND WAS IN QUESTION OF WHY HER BELT HAD DETACHED FROM THE RECEIVER. THE WAS NO VISIBLE DAMAGE TO THE MECHANISM, HOWEVER UPON INITIAL IMPACT I DISTINCTLY REMEMBER HEARING A METALLIC "CLINK" NOISE FOLLOWED BY MY WIFE COMING OUT OF HER PASSENGER SEAT. THIS WAS NOTED IN THE ACCIDENT REPORT AND WAS DESCRIBED TO ALL FIRST RESPONDERS ON SITE. *TR