On September 29, 2020, the D.C. Circuit Court of Appeals stayed the compliance dates for fuel economy regulations adopted by the Obama administration to the extent the regulations apply to truck trailers. The court heard oral argument on September 15 in a case challenging not only the fuel economy regulations, which the National Highway Traffic Safety Administration (NHTSA) promulgated, but also greenhouse gas emissions standards promulgated by the U.S. Environmental Protection Agency (EPA) in the same rulemaking. In October 2017, the D.C. Circuit stayed the EPA standards, which would have taken effect in January 2018. The NHTSA regulations would have taken effect in January 2021. In its stay motion, the Truck Trailer Manufacturers Association (TTMA) argued that the court had already determined that its challenge to the EPA standards was likely to be successful and that the NHTSA standards could not function without the EPA standards. TTMA also argued that NHTSA lacked authority to regulate fuel economy of trailers. In addition, TTMA asserted that its members would suffer immediate and irreparable harm in the absence of a stay. Both EPA and NHTSA are still in the process of reconsidering their trailer rules.

Challenge to greenhouse gas emissions and fuel efficiency standards for medium- and heavy-duty engines and vehicles.

Truck Trailer Manufacturers Association, Inc. v. EPA

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D.C. Circuit Stayed Compliance Dates for Obama-Era Truck Trailer Fuel Economy Standards

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