States across the country are accelerating their drive for new revenue to repair aging road systems, moves that come as the amount of federal funding has been falling.

Figures compiled by The Associated Press show the total amount of money available to states from the Federal Highway Trust Fund declined 3.5 percent during the five-year period ending in 2013. During that span, the amount of inflation-adjusted federal highway money dropped in all but two states.

Some states are warning of multibillion-dollar shortfalls in their transportation programs.

Highway funding increases could be on the agenda in as many as one-third of state legislatures this year. That comes after roughly one-fourth of the states increased transportation taxes or fees during the past two years, a contrast to the inaction in Congress.