Bicyclists in San Francisco must obey all traffic signals as any other vehicle on the road. If not, they can potentially be responsible for an accident either involving a car or a pedestrian who will naturally assume that bicyclists will yield to the right of way.
It appears that a bicyclist who ran a red light and did not yield to the right of way was responsible for crashing into a pedestrian who was crossing Market Street in the crosswalk at the intersection with Castro Street. The pedestrian, who is believed to be at least 65 years old, was struck down and knocked unconscious. His injuries were originally believed to be serious enough to be considered life-threatening. According to police, he is, however, expected to survive.
Police on the scene of the accident questioned witnesses who confirmed that the bicyclist ran a red light while he was bicycling through Market Street.
The bicyclist was also left unconscious after the crash. He was taken to San Francisco General Hospital to be treated for his injuries. The extent of his injuries is yet unknown.
Hopefully the pedestrian will survive from the serious injuries he sustained in this pedestrian accident. However, depending on the extent of his injuries, he may be looking at a very long recovery and rehabilitation, especially when considering his age. Some types of injuries are so severe that complete recovery is not possible, such as in the case of brain and spinal cord injuries. This is particularly true when pedestrians are hit at high speeds because they are not wearing any protection that can help to shield them from the impact of a crash.
Source: San Francisco Chronicle, "Pedestrian, cyclist injured in crash in Castro," Ellen Huet, March 29, 2012