This is just the coolest. Solar powered and everything!
"TPA’s glowing path doesn’t require a power source. Instead, it is completely self-sufficient. It relies on phosphor—a synthetic material— to collect sunlight which then enables it to light up luminophores at night for up to ten hours."
http://www.curbed.com/2016/10/5/13176596/bike-paths-sustainable-des...
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