Abstract
Automotive manufacturers are developing systems to remind drivers and passengers to use their seat belts. The National Highway Traffic Safety Administration (NHTSA) is prevented by law from requiring warning sounds longer than eight seconds, but it is encouraging automakers to voluntarily install longer warnings. Belt reminders include sounds, such as chimes, and warning lights, with the loudness, urgency, sequence and duration of the lights and sounds varying. Audible warnings may be more difficult to ignore than lights-only reminders. Ford introduced a chime and light combination that continues for five minutes if vehicle occupants do not buckle up, and it has produced an increase in seat belt use.