DIY turn signal biking jacket
http://www.cs.colorado.edu/~buechley/LilyPad/build/turn_signal_jacket.html
http://www.cs.colorado.edu/~buechley/LilyPad/build/turn_signal_jacket.html
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Baltimore Spokes
https://www.baltimorespokes.org/article.php?story=20090118040636747