Which is kind of like an accounting trick. The state already has the land, run a rail line through it instead of expanding it, etc. But ultimately the expansio

Which is kind of like an accounting trick. The state already has the land, run a rail line through it instead of expanding it, etc. But ultimately the expansion of the highways has downstream effects - state will buy new land, build new roads, etc. as density flows out. If you have a two lane highway going into a city and it's congested, and then you expand it, more people move out of the city or more further away - obviously someone is building new roads or expanding existing ones as that occurs.