MY VEHICLE WAS HIT IN THE REAR WHILE EXITING A HIGHWAY ON THE EXIT RAMP APPROACHING A STATE HWY. ,TRAVELING AT APPROXIMATELY 25-30 MPH AT THE TIME.THE IMPACT DEPLOYED THE HEADRESTS BUT THE SEAT BELTS DID NOT RESTRAIN THE DRIVER OR THE PERSON IN THE PASSENGER SEAT CAUSING HEAD TRAUMA TO THE DRIVER.AS A RESULT OF HITTING THE STEERING WHEEL. THE DRIVER WAS TAKEN , BY AMBULANCE,TO THE HOSPITAL FOR MEDICAL TREATMENT. THAT DAY I CONTACTED MY DEALER AND REQUESTED THAT THE VEHICLE BE INSPECTED ( SEAT BELTS AND HEAD REST) AT A LOCAL DEALER THE NEXT DAY AND THE HEAD RESTS BE RE-SET. HYUNDAI REFUSED TO ALLOW THE DEALER TO TOUCH THE VEHICLE AND HIRED A 3RD PARTY ENGINEERING FIRM TO INSPECT THE VEHICLE. THE INSPECTION WAS PERFORM AT MY LOCAL DEALER AND I WAS PRESENT DURING THE INSPECTION ( MEASUREMENTS ONLY WERE TAKEN). HYUNDAI CONTACTED ME AND SAID THAT SEAT BELTS AND HEAD RESTS WERE FOUND TO BE OPERATING ACCORDING TO DESIGN. THEY ALSO DIRECTED ME TO SAFECAR.GOV WEBSITE FOR MY REQUESTED CRASH TEST DATE WHICH THEY DID NOT SUPPLY. I CHECKED THE WEBSITE AND ONLY FOUND ROLLOVER, FRONTAL AND SIDE CRASH DATA. I WOULD LIKE TO HAVE THE NHTSA REVIEW TEST DATA FOR REAR END COLLISIONS WITH BOTH VEHICLES MOVING AT SPEEDS BETWEEN 25-30 MPHFOR 1ST VEHICLE AND 40 MPH FOR THE 2ND VEHICLE. I BELIEVE THAT THE HEADRESTS WILL DEPLOY BUT THE SEAT BELTS WILL NOT RESTRAIN THE DRIVER AND THE PASSENGER. THIS IS A SAFETY ISSUE THAT CANNOT BE KNOWN TO THE GENESIS OWNERS UNTIL IT IS TOO LATE. I DO NOT HA