Thousands of cyclists descended upon San Francisco on Friday for the 20th anniversary of Critical Mass--a global biking event.
Riders wore costumes and included families, bike messengers and cycling enthusiasts for an evening ride across the city. Motor traffic was, as predicted, snarled.
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Did you attend the ride? Let us know how it went in the comment section. In the meantime, check out some photos from the event in the slideshow below:
