See, this is one of the many reasons why governments should not be in charge of the roads.
But it does bring up an interesting question: what can be done with all of that radioactive soil, besides leaving it where it lies? I would like to see some test data on how roads built on top of radioactive soil would fare. Would they offgas? Would there be a runoff issue?
I remember a while back reading about a subspecies of oyster mushroom fungus that had taken up residence in Chernobyl and was metabolizing the radioactive soil. I've often wondered since if that fungus could be cultivated and used to help clean up after nuclear waste spills.