For the past 20 years plus change, Cyclists gather in Downtown San Francisco on the last Friday of the Month for a group bike ride through City Streets. ( SFWiki.org/Critical_Mass )
This rapid-fire slideshow are images captured during my Friday March 29 2013 Critical Mass bike ride in San Francisco.
Creative Commons Attribution Music: "Call to Adventure" by Kevin MacLeod ( soundcloud.com/kevin-9-1/call-to-adventure )
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