Also known as a HAWK Beacon, it is a device installed at crosswalks when a regular traffic signal is not appropriate but something more than flashing lights is needed.  Caltrans made a video for people who want to know more.   Go to https://www.youtube.com/watch?v=JdauhuZaChM&feature=youtu.be
to see what might be installed in a city near you in the near future.    
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