I didn't mean that the federal agencies should necessarily have a role here. I would think that many US states also have agencies charged with administrating th

I didn't mean that the federal agencies should necessarily have a role here. I would think that many US states also have agencies charged with administrating the law, something like a "Arizona Roadway Authority" or whatever. My comment was trying to explain how even within a single hierarchy like a state's executive, which a Governor at the top and traffic engineers somewhere below, it's peculiar to see someone jump so many levels of that hierarchy to assume control of a rather low-level decision.