40 C.F.R. § 85.1702
As used in this subpart, all terms not defined herein shall have the meaning given them in the Act:
Certificate holder has the meaning given in 40 CFR 1068.30 .
Export exemption means an exemption granted by statute under 42 U.S.C. 7522(b)(3) for the purpose of exporting new motor vehicles or new motor vehicle engines.
National security exemption means an exemption which may be granted under 42 U.S.C. 7522(b)(1) of the Act for the purpose of national security.
Pre-certification vehicle means an uncertified vehicle that a certificate holder employs in fleets from year to year in the ordinary course of business for product development, production method assessment, and market promotion, but not involving lease or sale.
Pre-certification vehicle engine means an uncertified heavy-duty engine owned by a manufacturer and used in a manner not involving lease or sale in a vehicle employed from year to year in the ordinary course of business for product development, production method assessment and market promotion purposes.
Testing exemption means an exemption which may be granted under 42 U.S.C. 7522(b)(1) for the purpose of research investigations, studies, demonstrations or training, but not including national security.
40 C.F.R. §85.1702