Helmets are necessary for bicycle safety.
More than 75 percent of all biking deaths are caused by head injuries. If all cyclists wore helmets, perhaps half of these deaths and injuries, especially in children, could be avoided. Wearing a helmet reduces the risk of head injury in a crash by 85 percent. Common head injuries caused by biking accidents are skull fractures and brain contusions. Other serious bicycle injuries include neck injuries, abdominal injuries, and multiple fractures of the legs, cervical vertebrae, ribs, and pelvis.