Congress created the Highway Trust Fund (HTF) in 1956 to fund construction of the Interstate Highway System. The HTF is funded primarily though an 18.4-cent per gallon federal excise tax on gasoline. Funding for the HTF expires May 31, and with the HTF facing a budget shortfall, some in Congress have proposed raising the federal gasoline tax.
H/T & Cartoon credit A.F. Branco at ComicallyIncorrect.