U.S. toll roads are maintaining high investment-grade ratings, despite the slow economic recovery, Fitch Ratings said Thursday, releasing its first annual review of the toll roads it rates.

"Rating changes from small reductions in traffic volumes or slowing growth were tempered due to continued, albeit reduced, pricing power," Scott Zuchorski, director of Fitch's global infrastructure and project finance group, said, explaining that pricing power means the ability to raise tolls.

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