I WAS DRIVING A FORD FOCUS 2008 AT APPROXIMATELY 15-20 MPH IN TRAFFIC AND DROVE DIRECTLY INTO THE BACK OF ANOTHER VEHICLE WITHOUT BREAKING. THE OTHER VEHICLE, A LEXUS SEDAN WAS STOPPED. THE FORD FOCUS WAS UP TO DATE ON ALL SAFETY INSPECTIONS AND AIRBAGS WERE SET ON. IN SPITE OF THIS, NO AIRBAGS DEPLOYED AND I SUSTAINED A HEAD INJURY FROM THE COLLISION.