WASHINGTON — Public-private partnerships do not necessarily supply more funds for highway construction than traditional government financing, and spending by the private party must be restricted by budget caps or legal limits for states and localities to see benefits from P3s, a Congressional Budget Office study concluded Monday.

“Revenues from the users of roads and from taxpayers are the ultimate source of money for highways, regardless of the financing mechanism chosen,” the study says. “The cost of financing a highway project privately is roughly equal to the cost of financing it publicly after factoring in the costs associated with the risk of losses from the project, which taxpayers ultimately bear, and the financial transfers made by the federal government to states and localities.”

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