Even in a safety conscious country such as the United State of America, failure to wear their seatbelts has let to avoidable deaths and injuries among teens and adults who died were unrestrained as at the time of the crash.
Another study by nordisk trafiksikker hedsrad (1984) calculated that 'drivers and front seat passengers who do not use seatbelts suffer almost the same percentage of head injuries as non-users in rear seats'.
Therefore, use of seatbelt by rear seat passengers could not only reduce the likelihood and severity of injury to themselves, but also to drivers and/or front seat passengers.
Statistics from traffic management agencies and groups in developed countries reveal percentage of severity of injuries of deaths resulting from non-use of seatbelts in the event of a crash or a sudden stop.
The car stops in the first tenth of a second, but you keep on at the same rate you were going in the car until something stops you - the steering wheel, dashboard or windshield - if you're not wearing your safety belt... Bad enough at 15 miles an hour, but at 30 miles you hit "the wall" four times as hard as you would at 15.
