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Sounds like a great idea for car windshields... They're clear so should be street-legal, they block the infrared light responsible for much of the heat, they block the ultraviolet light that hurts your eyes and makes you squint, and they also float-charge your battery while you're parked in the sun, or maybe even turn an exhaust fan. A little less load on your alternator would improve gas mileage by a hair.

Only big problem with the idea is windshields get damaged and need to be replaced somewhat frequently, so the solar tech needs to be cheap enough that it doesn't quadruple the cost.