I do also want to point to a new road technolgy being developed by private businesses.
http://www.solarroadways.com/main.html
Recently, yes this group earned a contract with the DOT, but their beginnings was from General Electric and they have been questioned by many cities who were/are interested in purchasing them and funding installation projects themselves. Plus, I'm fairly sure all the contract states is they are allowed to "pave" the roads with their technolgy and have the DOT charge for use.