470,333 vehicles registered to San Francisco residents according to http://www.sfmta.com/cms/rfact/documents/SFFactSheet2009_November2009_FINAL.pdf http://www.s

470,333 vehicles registered to San Francisco residents according to http://www.sfmta.com/cms/rfact/documents/SFFactSheet2009_November2009_FINAL.pdf http://www.sfmta.com/cms/rfact/documents/SFFactSheet2009_Nov...