The National Highway Traffic Safety Administration moved to reverse an Obama-era rule governing commercial truck engine manufacturing, arguing the regulation unfairly constrained innovation and domestic production in the trucking industry, on Aug. 28.
The rollback is expected to face legal challenges from environmental and clean air advocacy groups and sets up a major policy battle over truck emissions standards that affect air quality in communities near highways and freight corridors.
The administration argued the original rule placed unnecessary burdens on truck engine manufacturers and limited their ability to develop and produce engines domestically, NHTSA said. Commercial trucks are a major component of the U.S. freight transportation system.
Environmental groups have countered that commercial trucks are a significant source of greenhouse gas emissions and particulate pollution, and that efficiency standards drive technological improvements that benefit public health and reduce fuel consumption.
The Sierra Club and similar organizations have pledged to challenge deregulatory actions targeting vehicle emissions standards through litigation, arguing they violate Clean Air Act requirements.
Truck engine manufacturers, including Cummins and other major producers, have invested in compliance with existing standards. Industry groups have offered mixed reactions to deregulatory proposals, with some supporting reduced compliance costs and others expressing concern about regulatory uncertainty.
The action is part of a broader deregulatory agenda targeting Obama-era vehicle fuel efficiency and emissions standards across both passenger vehicles and commercial fleets.
State air quality agencies, particularly in California and other states that have adopted more stringent emissions standards, may pursue independent enforcement even if federal rules are relaxed. The rollback will proceed through the federal rulemaking process, including a public comment period.