“[A]bout 800 deaths and more than half a million emergency room visits related to bicycling occur in the United States each year. Head injuries account for about two-thirds of hospitalizations and three-fourths of deaths…”

”[…]’dooring,’ the all-too-common event in which a parked driver flings opens a door, creating a sudden obstacle for an oncoming cyclist. Incidents like these, along with drivers’ failure to give bikers the right of way, account for nearly half of all bicycle-vehicle accidents.”

“In the Netherlands, where biking has long been part of the urban fabric, people are taught in driver education courses to reach across their bodies and open the driver’s door with the right hand, which forces the driver to look over the left shoulder to see if any bicyclists are coming.”

“In one experiment, [University of Bath psychologist, Ian Walker] rode a bicycle while dressed as a man, and then while dressed as a woman, and found that drivers gave less passing room to men, a finding that was confirmed in subsequent studies by others in Florida and Taiwan. He also found that drivers gave him less space when he was wearing a helmet.”