WASHINGTON — Fitch Ratings warned on Wednesday that grant anticipation revenue vehicle bonds, known as Garvees, face heightened uncertainty as Congress struggles to reauthorize transportation spending.

With federal gas-tax revenue failing to keep pace with spending, Fitch revised its outlook for stand-alone Garvee bonds — those that lack a back-up pledge from a state — to negative from stable. The outlook change applies to Garvee debt issued in 13 states.

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