 In an interview, Peters said that the National Highway System will run out of money by decade's end without substantial changes and, rather than raise taxes, some states should turn to toll roads leased to private corporations to fill gaps.Her policies of promoting open borders for commerce created opposition from labor unions.Mary Peters held a press conference on September 5, 2008 to report that Highway Trust Fund payments to states, including her native Arizona, would be cut back because federal fuel tax collections were dropping.