Increases in California’s gas tax and vehicle fees approved last week are expected to raise $52.4 billion over 10 years for the state’s backlog of road and bridge repairs. It is, by any measurement, a significant amount of money — Gov. Jerry Brown dubbed the proposal “a hell of a good deal” — but only about half of what the state would ultimately like to put behind large-scale improvements in the Inland Empire and beyond if the federal government is willing.