An interim report issued by the National Surface Transportation Infrastructure Finance Commission calls for exploration of more direct user charges, like tolling, to fund the nation's surface transportation system instead of continuing to rely on the federal gas tax.

"While more funding is needed at all levels of government - regardless of the source - funding more of the system costs through direct user charges, rather than indirect fees such as the fuel tax or general revenues, can encourage more efficient use of system capacity," said the report published late Friday.

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