I was driving on interstate 75 near bradenton in fl. 1:00 p.m. perfectly clear & dry day. i was hit from behind, sent my ford into the grassy median, car came to a stop at a wire guard rail. i didn't hit another vehicle. i was knocked unconscious, so i have no recall. this happened near a construction area & all i remember is traffic slowing, perhaps i was going 45-50 mph, & in process of slowing down. although there was extensive damage to left front & side no airbags deployed. my head/face apparently hit the steering wheel. therefore seat belt restraints did not hold me tight to the seat. i was taken to e.r. - had a concussion, they did lots of tests, kept me overnight in icu, discharged the next day. also, later i was told by auto collision company & insurance investigator that the driver seat was damaged & had apparently come loose. the vehicle was totaled.