Heavy-duty Vehicle and Engine Greenhouse Gas Emission Regulations — 1
ent model years, 15 years or 241 401 km (150,000 miles), whichever occurs first; (b) vocational vehicles that are light heavy-duty vehicles and incomplete vocational vehicles that are to become light heavy-duty vehicles, namely, (i) for the 2020 model year and earlier model years, 10 years or 177 027 km (110,000 miles), whichever occurs first, and (ii) for the 2021 model year and subsequent model years, 15 years or 241 401 km (150,000 miles), whichever occurs first; (c) vocational vehicles that are medium heavy-duty vehicles, incomplete vocational vehicles that are to become medium heavy-duty vehicles, Class 7 tractors and incomplete tractors that are to become Class 7 tractors, namely, 10 years or 297 728 km (185,000 miles), whichever occurs first; (d) vocational vehicles that are heavy heavy-duty vehicles, incomplete vocational vehicles that are to become heavy heavy-duty vehicles, Class 8 tractors and incomplete tractors that are to become Class 8 tractors, namely, 10 years or 700 064 km (435,000 miles), whichever occurs first; (e) heavy-duty engines, namely, (i) in the case of spark-ignition engines and of light heavy-duty engines that are compression-ignition engines of the 2021 model year or a subsequent model year, 15 years or 241 401 km (150,000 miles), whichever occurs first, and (ii) in any other case, the same useful life as that which is set out for the type of engine in question in section 2 of Title 40, chapter I, subchapter C, part 86, subpart A, of the CFR for emissions of oxides of nitrogen (NO X ), hydrocarbon (HC), particulate matter (PM) and carbon monoxide (CO); and (f) trailers, namely, 10 years. Roof height — tractors (6) Subject to subsections (7) and (8), “roof height” refers to the maximum height of a tractor, rounded to the nearest inch, excluding small accessories such as exhaust pipes and antennas, but including large accessories such as roof fairings, and measured with tires inflated to the manufacturer’s recommended cold tire inflation pressure and without occupants or cargo onboard. Roof height measurement — tractors (7) The roof height of a tractor must be measured with a static loaded radius equal to the arithmetic mean of the largest and smallest static loaded radius of the tires that are recommended for the tractor by the manufacturer. Adjustable roof fairing — tractors (8) In the case of a tractor equipped with an adjustable roof fairing, the roof height must be measured with the fairing in its lowest setting. Length — trailer (8.1) The length of a trailer corresponds to (a) the outer dimensions of its load-carrying structure, excluding any aerodynamic devices and any heating, ventilating or air-conditioning systems; and (b) in the case of a B-train trailer, the outer dimensions of its load-carrying structure, excluding its rear fifth-wheel coupling section, any aerodynamic devices and any heating, ventilating or air-conditioning systems. Number of axles (8.2) The number of axles on a vehicle or trailer includes any axles that can be used to carry the loaded or unloaded weight of the vehicle or the trailer while in motion, including lift axles. Family emission limit (9) A family emission limit and a CO 2 family certification level must be expressed to the same number of decimal places as the emission standard they replace. Spark-ignition engines (10) For the purposes of these Regulations, a spark-ignition engine of the 2020 model year or an earlier model year that is regulated as a diesel engine under part 86 of Title 40, chapter I, subchapter C, of the CFR must conform to the standards, test procedures and calculation methods applicable to a compression-ignition engine of the same model year. Compression-ignition engines (11) For the purposes of these Regulations, a compression-ignition engine of the 2020 model year or an earlier model year that is regulated as an Otto-cycle engine under part 86 of Title 40, chapter I, subchapter C, of the CFR must conform to the standards, test procedures