Lots of cameras at the 20th anniversary of Critical mass in San Francisco. This video is at Grant and Market and doesn't show the whole thing, but it's 20 minutes long. It took 30+ minutes for everyone to pass, so it gives a pretty good idea of how many thousands of bikes there were. The time on the video is off by one hour. It should be 7pm, not 6pm The photos are from Justin Herman Plaza just before it began
