How does the Highway Trust Fund work?

As Congress attempts to negotiate a multiyear surface transportation reauthorization bill to replace the FAST Act — which expires on Sept. 30 — finding the money to pay for it will be the most contentious issue. Central to the pay-for question is the Highway Trust Fund (HTF).

Congress established the fund in 1956 as a way for the federal government to fund the construction of the Interstate Highway System. After much of the work on the system was completed, spending out of the HTF shifted to...

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