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| 29  August 2008, Critical Mass | 
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  Off they sped by the hundreds up Market Street Critical Mass, Market Street at Stuart Street • San Francisco, California • (Photo posted Sunday 31 August 2008) • (Photo taken Friday 29 August 2008) • © 2008 Bryan Costales    #CriticalMassSF20080829_2634BCX Add a comment or report a mistake 
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  Nearing sunset, they prepared to ride Critical Mass, Justin Herman Plaza • San Francisco, California • (Photo posted Sunday 31 August 2008) • (Photo taken Friday 29 August 2008) • © 2008 Bryan Costales    #CriticalMassSF20080829_2625BCX Add a comment or report a mistake 
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  Man in a bandana teased with a slogan Critical Mass, Justin Herman Plaza • San Francisco, California • (Photo posted Sunday 31 August 2008) • (Photo taken Friday 29 August 2008) • © 2008 Bryan Costales    #CriticalMassSF20080829_2627BCX Add a comment or report a mistake 
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  One rider carried spare parts on his bike Critical Mass, Justin Herman Plaza • San Francisco, California • (Photo posted Sunday 31 August 2008) • (Photo taken Friday 29 August 2008) • © 2008 Bryan Costales    #CriticalMassSF20080829_2628BCX Add a comment or report a mistake 
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  With shouts, they began to ride Critical Mass, Justin Herman Plaza • San Francisco, California • (Photo posted Sunday 31 August 2008) • (Photo taken Friday 29 August 2008) • © 2008 Bryan Costales    #CriticalMassSF20080829_2629BCX Add a comment or report a mistake 
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  Hundreds of bicycles gathered at the foot of Market Street Critical Mass, Justin Herman Plaza • San Francisco, California • (Photo posted Sunday 31 August 2008) • (Photo taken Friday 29 August 2008) • © 2008 Bryan Costales    #CriticalMassSF20080829_2620BCX Add a comment or report a mistake 
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  Their mass critically filled Market Street Critical Mass, Market Street near Spear Street • San Francisco, California • (Photo posted Sunday 31 August 2008) • (Photo taken Friday 29 August 2008) • © 2008 Bryan Costales    #CriticalMassSF20080829_2638BCX Add a comment or report a mistake 
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  Tourists were amazed Critical Mass, Market Street near foot of California • San Francisco, California • (Photo posted Sunday 31 August 2008) • (Photo taken Friday 29 August 2008) • © 2008 Bryan Costales    #CriticalMassSF20080829_2645BCX Add a comment or report a mistake 
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  Street people had seen this all before Critical Mass, Market Street near foot of California • San Francisco, California • (Photo posted Sunday 31 August 2008) • (Photo taken Friday 29 August 2008) • © 2008 Bryan Costales    #CriticalMassSF20080829_2646BCX Add a comment or report a mistake 
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  Some bikes were tall Critical Mass, Market Street near foot of California • San Francisco, California • (Photo posted Sunday 31 August 2008) • (Photo taken Friday 29 August 2008) • © 2008 Bryan Costales    #CriticalMassSF20080829_2650BCX Add a comment or report a mistake 
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  Sadly, public transit was stopped in addition to cars Critical Mass, Market Street passing Main Street • San Francisco, California • (Photo posted Sunday 31 August 2008) • (Photo taken Friday 29 August 2008) • © 2008 Bryan Costales    #CriticalMassSF20080829_2656BCX Add a comment or report a mistake 
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  An assortment of helmets, hats, and just hair Critical Mass, Market Street past Main Street • San Francisco, California • (Photo posted Sunday 31 August 2008) • (Photo taken Friday 29 August 2008) • © 2008 Bryan Costales    #CriticalMassSF20080829_2659BCX Add a comment or report a mistake 
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  The lead had reached Powell while the plaza still drained Critical Mass, Market Street past Main Street • San Francisco, California • (Photo posted Sunday 31 August 2008) • (Photo taken Friday 29 August 2008) • © 2008 Bryan Costales    #CriticalMassSF20080829_2660BCX Add a comment or report a mistake 
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  Traffic was halted at Pine Street on way to Freeway Critical Mass, Market Street at Pine Street • San Francisco, California • (Photo posted Sunday 31 August 2008) • (Photo taken Friday 29 August 2008) • © 2008 Bryan Costales    #CriticalMassSF20080829_2666BCX Add a comment or report a mistake 
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  Traffic was halted on Freemont Street heading up town Critical Mass, Market Street at Freemont Street • San Francisco, California • (Photo posted Sunday 31 August 2008) • (Photo taken Friday 29 August 2008) • © 2008 Bryan Costales    #CriticalMassSF20080829_2673BCX Add a comment or report a mistake 
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  Sadly the F trolley was halted too Critical Mass, Market Street near Freemont Street • San Francisco, California • (Photo posted Sunday 31 August 2008) • (Photo taken Friday 29 August 2008) • © 2008 Bryan Costales    #CriticalMassSF20080829_2675BCX Add a comment or report a mistake 
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  He chatted with the banana as they rode Critical Mass, Market Street near Freemont Street • San Francisco, California • (Photo posted Sunday 31 August 2008) • (Photo taken Friday 29 August 2008) • © 2008 Bryan Costales    #CriticalMassSF20080829_2677BCX Add a comment or report a mistake 
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  Traffic from Bush and Battery was halted Critical Mass, Market Street at Battery Street • San Francisco, California • (Photo posted Sunday 31 August 2008) • (Photo taken Friday 29 August 2008) • © 2008 Bryan Costales    #CriticalMassSF20080829_2683BCX Add a comment or report a mistake 
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  As the last bikes passed, so did the police escort Critical Mass, Market Street at Battery Street • San Francisco, California • (Photo posted Sunday 31 August 2008) • (Photo taken Friday 29 August 2008) • © 2008 Bryan Costales    #CriticalMassSF20080829_2684BCX Add a comment or report a mistake 
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