March 30, 2012
On Friday, March 30, 2012, the President signed into law:
H.R. 4281, the "Surface Transportation Extension Act of 2012," which provides funding for programs funded from the Highway Trust Fund (HTF) for the period April 1, 2012, through June 30, 2012; and extends the authority to make expenditures from the HTF for HTF-financed programs through June 30, 2012.
Barack Obama, Statement by the Press Secretary on H.R. 4281 Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/309849