Highway Spending: Down Across the Board.

     Highways are built with a combination of funds from all levels of Government...and all levels are reducing their spending, reports PEW:

This transportation funding system is confronting significant difficulties in maintaining investments at all levels of government. Between 2002 and 2011, overall spending on surface transportation fell by $27 billion, or 12 percent in real terms. States have experienced a particularly large decline, with spending falling by $20 billion, or 20 percent in real terms, over this period.² 
At the federal level, the highway trust fund, the source of most federal funding for the country’s roads and transit infrastructure, has seen revenue fall short of expenditures for more than a decade.

     Look at the graphics page of The PEW Report for information about your state. More than 35% of highway funds in Alabama come from the Federal Government.