1. Short title This Act may be cited as the Supporting Trucking Efficiency and Emission Reductions Act or the STEER Act . 2. Definitions In this Act: (1) Class 8 truck The term Class 8 truck means a vehicle with a gross vehicle weight rating exceeding 33,000 pounds. (2) Covered expenditure The term covered expenditure means an expense that is associated with the purchase and installation of an emission reducing active technology, including— (A) the cost of an emission reducing active technology; and (B) material and labor costs associated with the installation of an emission reducing active technology. (3) Eligible entity The term eligible entity means an applicant to which a voucher under the program may be made available, including— (A) an individual; (B) a State or local government; (C) a private entity; (D) a not-for-profit entity; (E) a nonprofit entity; and (F) such other applicants the Secretary determines to be appropriate. (4) Emission reducing active technology The term emission reducing active technology means any physical alterations of a Class 8 truck that can be installed as a retrofit and that adapts automatically to control vehicle performance factors and improve fuel efficiency, including— (A) active aerodynamics; (B) active rolling resistance; (C) dynamic axle lift control; (D) non-auxiliary power unit active idle reduction