DALLAS -- Tolls on existing interstate highways could become the revenue source needed to maintain and expand the 47,000-mile network in the U.S. if the public can be persuaded to pay to drive on roads that have been toll-free for decades, according to a report by Fitch Ratings.

The billions of dollars that could be realized each year from interstate tolls could help bridge the widening gap between the cost of keeping up and growing the national highway network and the revenues that are currently available for the effort, Fitch managing director Cherian George said in the report, which was released on Thursday.

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