The aim of the study was to elucidate the crash and injury mechanisms
in bicycle fatalities in the northern half of Sweden. All available au
topsy protocols, hospital records and police reports were scrutinized.
In 11 years, 146 bicyclists were fatally injured. The majority of the
victims were males (66%) and the median age was 60 years. Most of the
crashes 181%) occurred from May through October, during weekdays (84%
), and during daylight (86%). Almost all victims (88%) died in a motor
vehicle collision, in 21% with a truck. None was wearing a helmet. Po
or hearing and cerebral arterosclerosis were probable risk factors amo
ng the elderly. Of the victims tested, 10% were under the influence of
alcohol, half of whom were involved in single-bicycle crashes. In an
additional five cases, the motor vehicle driver was impaired by alcoho
l. All injuries were due to blunt trauma and 69% of the victims died f
rom head injuries. In 91% of all cases, there was an Abbreviated Injur
y Scale (AIS) score of the head region of greater-than-or-equal-to 3.
The results indicate that separation of bicyclists from motor vehicle
traffic by separate cycling tracks and protection of the head by a hel
met would be beneficial.