Bicycle accident and injury data collected by two samples of North Carolina hospital emergency rooms during the summers of 1985 and 1986 are examined and compared with State police-reported bicycle accident data for the same time period. Whereas virtually all of the police-reported accidents involved a motor vehicle, less that a fifth of the emergency room cases did. Overall, only 10 percent of the emergency room cases were duplicated on the State accident files. It is estimated that 800 children ages 0-19 are hospitalized annually in North Carolina for bicycle related injuries, and an additional 13,300 children receive emergency room treatment.