This is the biggest scam going. First, the state legislatures can't keep their hands off of the "infrastructure" funds and raid them for general account spending all the time. Second, even if money is spent on "infrastructure," its used to pay over-priced union salaries or for contracts with political cronies. And its also used for things like expensive electronic billboards that aren't really necessary.
Rain gardens, bike paths, greenways, public transportation and on and on and on.
If we spent the money collected for transportation where its supposed to be spent (primarily interstate roads and bridges) we would have the finest interstate roads and bridges on the planet. A good case can also be made for upkeep on freight rail.