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All good points. I imagine there would be some places where certain more limited applications would make more sense. Walkways, for example. Such technologies could turn into higher end architectural elements when a builder's client might balk at large solar arrays but yet want "green" power. Maybe parts of public roads, too. But I can't see this specific idea fully replacing current road surfaces, either.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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