Funding and Financing Highways and Public Transportation

For many years, federal surface transportation programs were funded almost entirely from taxes on motor fuels deposited in the Highway Trust Fund. The tax rates, which are fixed in terms of cents per gallon, have not been increased at the federal level since 1993. Meanwhile, motor fuel consumption is projected to decline due to improved fuel efficiency, increased use of electric vehicles, and slow growth in vehicle miles traveled. In consequence, revenue flowing into the Highway Trust Fund has been insufficient to support the surface transportation program authorized by Congress since 2008.

Source: Funding and Financing Highways and Public Transportation