In essentially a repeat of 2014, congress passed and President Obama signed the Highway and Transportation Funding Act of 2015, enacting a 60-day extension of the Highway Trust Fund, through the end of July. Funding expired May 31, 2015 and according to Overdrive:
This is Congress’ 33rd stopgap surface transportation measure in a decade despite introduction of several long-term bills ... Lawmakers have not approved a long-term funding bill since the last one became law in 2005, followed by passage of a two-year bill in 2012. Obama said this “continual pattern of uncertainty” has caused states to cancel or delay projects during peak construction season.
Labor leaders echoed the president's concerns. Edward Wytkind, president of the Transportation Trades Department, AFL-CIO said in a statement:
Years of congressional inaction on a long-term surface transportation bill has harmed our economy...
Specifically, H.R. 2353:
... authorizes appropriations through [July 31] for, specified federal-aid highway programs under:
the Moving Ahead for Progress in the 21st Century Act (MAP-21),
the Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users (SAFETEA-LU) Technical Corrections Act of 2008,
the Transportation Equity Act for the 21st Century (TEA-21),
the National Highway System Designation Act of 1995,
the Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA), and
other specified law.
Lawmakers had hoped to agree on a more permanent fix this time, and several proposals were raised – include raising the gas tax and using revenue from other tax reforms – but there's not yet agreement on just how to support the fund in a sustainable way. They'll need to figure out a way to secure roughly $15 billion a year to finance the fund for about six years, reported The Hill.