Heavy-duty Vehicle and Engine Greenhouse Gas Emission Regulations — 18
cles, (iv) heavy heavy-duty engines that are spark-ignition engines of the 2021 model year or a subsequent model year or compression-ignition engines and that are designed to be used in vocational vehicles and incomplete vocational vehicles, (v) medium heavy-duty engines that are compression-ignition engines and that are designed to be used in tractors and incomplete tractors, or (vi) heavy heavy-duty engines that are spark-ignition engines of the 2021 model year or a subsequent model year or compression-ignition engines and that are designed to be used in tractors and incomplete tractors; (c) in the case of full-aero box van trailers and subject to subsection (10), each fleet is composed solely of the trailers referred to in one of the following subparagraphs: (i) short dry box van trailers, (ii) long dry box van trailers, (iii) short refrigerated box van trailers, (iv) long refrigerated box van trailers. Class 2B and Class 3 heavy-duty vehicles (4) For the purposes of subparagraph (3)(a)(i), all of the following heavy-duty vehicles must be grouped into one separate fleet of Class 2B and Class 3 heavy-duty vehicles: (a) for the 2020 model year or an earlier model year, hybrid vehicles that have regenerative braking; (b) vehicles equipped with an engine that includes a Rankine-cycle or other bottoming cycle exhaust energy recovery system; (c) electric vehicles; (d) fuel cell vehicles; (e) vehicles that are manufactured with innovative technologies; and (f) for the 2021 model year and subsequent model years, plug-in hybrid vehicles. Subfleets — Class 2B and Class 3 (5) For the purposes of subparagraph (3)(a)(i) and subsection 20(3), the vehicles in the fleet that exceed the standards set out in subsection 20(1) and have more than one N 2 O or CH 4 family emission limit must be grouped into subfleets that include vehicles with identical N 2 O or CH 4 family emission limits, as the case may be, and that are of the same test group. Vocational vehicles and tractors (6) For the purposes of subparagraphs (3)(a)(ii) to (xvi), all heavy-duty vehicles of a fleet must (a) if applicable, be hybrid vehicles of the 2020 model year or an earlier model year that have regenerative braking, vehicles equipped with an engine that includes a Rankine-cycle or other bottoming cycle exhaust energy recovery system, electric vehicles, fuel cell vehicles, vehicles manufactured with innovative technologies or plug-in hybrid vehicles of the 2021 model year or a subsequent model year; and (b) be grouped into subfleets that include vehicles with identical CO 2 family emission limits if the vehicles in the fleet have more than one family emission limit. Vocational tractors (6.1) For the purposes of paragraph (3)(a), if a company has made the election referred to in subsection 28(2) in respect of a number of its vocational tractors, those vocational tractors must be grouped into fleets composed solely of vocational tractors that meet the description set out in, as the case may be, subparagraph (3)(a)(ii), (iii), (iv), (v), (vi), (vii) or (viii). Vocational vehicles — election under subsection 26(1.2) (6.2) For the purposes of subparagraphs (3)(a)(ii) to (viii), vocational vehicles that are of a type referred to in the table to subsection 26(1.2) and in respect of which a company has made the election referred to in that subsection must be grouped into separate fleets with each fleet being composed solely of vehicles of the same type. Roof heights, cab types and GVWR (7) If a vocational vehicle, incomplete vocational vehicle, tractor or incomplete tractor model straddles a roof height, cab type or GVWR division, a company may elect to group all those vehicles into the same fleet if they conform to the most stringent standards applicable to a vehicle in the fleet. Heavy-duty engines (8) For the purposes of paragraph (3)(b), all heavy-duty engines of a fleet must be of the same engine family or engine subfamily, as the case may be, and have, taking into account