Trailers removed from GHG 2 emissions regulations
In a November ruling, the D.C. Circuit Court of Appeals removed trailers from a joint EPA and National Highway Traffic Safety Administration (NHTSA) emissions regulation that had been scheduled to take effect on January 1, 2021.
The regulation in question was “Greenhouse Gas Emissions and Fuel Efficiency Standards for Medium- and Heavy-Duty Engines and Vehicles — Phase 2,” also known as GHG 2, which included a trailer portion that would mandate the use of low rolling resistance tires and aerodynamic devices, among other requirements. The D.C. Circuit Court’s ruling was in response to a petition from the Truck Trailer Manufacturers Association (TTMA), which sought a review of the trailer portion as it seemed to require devices that are already widely offered and would also be made mandatory whether or not they provide an actual fuel efficiency benefit.
The petition from TTMA was initially filed in 2016, and EPA granted a stay of its portion of the rule that was to go into effect in 2018. The 2020 and 2021 NHTSA deadlines remained in place, however, until this decision.
In granting the petition and vacating the portions of the rule applicable to trailers, the court found that, since trailers “have no motor,” they are not motor vehicles “[n]or are they ‘vehicles’ when that term is used in the context of a vehicle’s fuel economy, since motorless vehicles use no fuel.”
Key to remember: As they have no motor, trailers have been removed from GHG 2 regulations.

















































