; (B) active rolling resistance; (C) dynamic axle lift control; (D) non-auxiliary power unit active idle reduction; and (E) such other emerging improvements as the Secretary determines to be appropriate. (5) Program The term program means the program established under section 3(a). (6) Secretary The term Secretary means the Secretary of Energy. 3. Voucher program for emission reducing technologies on Class 8 trucks (a) In general Not later than 180 days after the date of enactment of this Act, the Secretary shall establish a program to award vouchers for covered expenditures associated with retrofitting emission reducing active technologies on Class 8 trucks. (b) Program requirements (1) Eligible technologies (A) In general Not later than 150 days after the date of enactment of this Act, the Secretary shall publish and maintain on the Department of Energy internet website a list of emission reducing active technologies that are eligible for the program, including biodiesel, electrification, ethanol, and hydrogen fuel cells. (B) Updates The Secretary may add to, or otherwise revise, the list of emission reducing active technologies under subparagraph (A) if the Secretary determines that an addition or revision will likely lead to— (i) greater usage of emission reducing active technologies; or (ii) greater access to emission reducing active technologies by users. (C) Location requirement To be eligible for the program, the emission reducing active technologies described in subparagraph (A) shall be installed in the United States. (2) Application (A) In general To be eligible to receive a voucher under the program, an eligible entity shall submit to the Secretary an application, which shall include— (i) the estimated cost of covered expenditures to be expended on the emission reducing active technologies that are eligible under paragraph (1); (ii) the estimated installation cost of the emission reducing active technologies that are eligible under paragraph (1)