Hourglass Stoplight Concept
http://www.geekologie.com/2010/11/sands_of_time_hourglass_stopli.php
http://www.geekologie.com/2010/11/sands_of_time_hourglass_stopli.php
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Baltimore Spokes
https://www.baltimorespokes.org/article.php?story=20101122235652399