Heavy-duty Vehicle and Engine Greenhouse Gas Emission Regulations — 26
 procedure set out in section 550 of Title 40, chapter I, subchapter U, part 1037, subpart F, of the CFR. Reference in CFR — interpretation (2.1) For the purposes of subsection (2), (a) a reference in the CFR to “regulatory subcategory” is to be read as a reference to the fleet referred to in one of subparagraphs 18(3)(a)(ii) to (viii) that includes the same type of vehicles as those to which the simulation model is being applied; and (b) motor homes and coach buses are to be treated as regional vocational vehicles and the other types of vocational vehicles or incomplete vocational vehicles referred to in column 1 of the table to subsection (1.2) are to be treated as urban vocational vehicles. Electric vehicles or fuel cell vehicles powered by hydrogen (2.2) For the purposes of this section and sections 34 to 47, the CO 2 emission rate of vocational vehicles and incomplete vocational vehicles of the 2021 model year or a subsequent model year that are electric vehicles or fuel cell vehicles powered by hydrogen is zero grams of CO 2 per short ton-mile. Exemption for certain vocational vehicles (3) The vocational vehicles and incomplete vocational vehicles referred to in subsections (1) and (1.1) do not include (a) vehicles whose main assembly is completed before January 1, 2021 and that are equipped with tires with a maximum speed rating of not more than 88 km/h (55 miles per hour); and (b) vehicles (i) that are designed to operate at low speeds unsuitable for normal highway operation or that have affixed components designed to operate in an off-road environment, and (ii) that (A) have an axle that has a GAWR of 13 154 kg (29,000 pounds) or more, (B) cannot attain a speed of more than 53 km/h (33 miles per hour) over 3.2 km (2 miles), (C) cannot attain a speed of more than 72 km/h (45 miles per hour) over 3.2 km (2 miles), have an unloaded vehicle weight that is not less than 95% of their GVWR and cannot carry occupants other than the driver and operating crew, or (D) cannot attain a speed of more than 87 km/h (54 miles per hour) (I) due to parameters that are not adjustable parameters as defined in subsection 15(1), or (II) without the engine with which it is equipped being at 95% or more of its maximum test speed in the highest available gear ratio. Non-eligible vehicles (4) The vehicles referred to in subsections (1.3) and (3) are not eligible for participation in the CO 2 emission credit system set out in sections 34 to 47. Weight reduction technologies (4.1) For greater certainty, CO 2 emission credits for weight reduction technologies other than those that are referred to in section 520(e) of Title 40, chapter I, subchapter U, part 1037, subpart F, of the CFR may be obtained under section 41. Election to conform to standards for heavier vehicles (5) For any given vehicle referred to in subsection (1) or (1.1), a company may elect to have the vehicle conform to the emission standards set out in subsection (1) or (1.1) that are applicable to a vehicle service class that includes vehicles that are heavier than those included in the vehicle service class to which the vehicle belongs, for a period that is equivalent to the useful life of those heavier vehicles, instead of the standards set out in subsection (1) or (1.1) that are applicable to the vehicle service class to which the vehicle belongs. Alternative standards (6) In the case of vocational vehicles and cab-complete vocational vehicles that are equipped with a spark-ignition engine, a company may elect to have one or more of its vehicles conform to the standards referred to in sections 20 to 23 that are applicable to Class 2B and Class 3 heavy-duty vehicles, taking into account section 1819(j) of Title 40, chapter I, subchapter C, part 86, subpart S, of the CFR, instead of the standards set out in subsection (1) or (1.1) and sections 29 and 30, if the following conditions are met: (a) those vehicles are grouped into the fleet referred to in subparagraph 18(3)(a)(i); (b)