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See-Through Windows Make Clean Electricity From Raindrops
(cleantechnica.com)
This is a most excellent place for technology news and articles.
I mean, I can think of many ideal places for such things. Intersections for instance, where cars will be wanting to slow down or come to a stop regardless. Speed limit changes, where you want cars to slow down. Even in place of speed bumps, assuming you can get enough of a drag on the car to effect a slow down.