Donating to solar roadways is pretty much admitting engineering is not your thing.
I think your concept is definitely possible and doesn't break any of the laws of physics, but I just cant see it being ever beneficial cost/energy wise.
Well my friend, Solar Roadways has been chosen by Popular Science as one of the 100 Greatest Innovations of 2014! It's in their 27th annual "Best of What's New" December issue and the department of energy as well as the California IOUs have asked us to submit proposals for grants... Looks like were both on the right path!
Take a look at the new projectexergy.com and let us know if this is any better.