You also may want to consult our coverage of Free Pubic transport in Tallinn and elsewhere via http://worldstreets.wordpress.com/category/free-public-transport/, and in particular our widely read Why Free Public Transport is perhaps a bad idea.
You can find another video on the Tallinn project produced at the time of project launch at http://www.youtube.com/watch?NR=1&v=MjOCFiX3kno&feature=endscreen.
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