Court Battle Erupts over Truck Trailers and GHG/MPG Rule
Court filings have begun to pile up that may ultimately determine the fate of the trailer-related provision within the federal Phase 2 Greenhouse Gas Emissions and Fuel Efficiency Standards.

Trailer aerodynamic device include side skirts, pictured here. Photo: Utility Trailer Mfg.

Court filings have begun to pile up that may ultimately determine the fate of the trailer-related provision within the federal Phase 2 Greenhouse Gas Emissions and Fuel Efficiency Standards.
On Oct. 12, the Environmental Defense Fund and a coalition of other environmental and public health groups formally requested that the U.S. Court of Appeals for the District of Columbia Circuit reject what they regard as the “eleventh-hour stay” of the trailer provisions filed as a motion with the court by the Truck Trailer Manufacturers Association on the 25th of last month.
In its statement of intervenor opposition asking the court to deny TTMA’s motion for stay of the Phase 2 trailer provision, EDF argues in part that “TTMA attempts to artificially divide the tractor from the trailer to claim that TTMA’s members cannot be regulated directly because they are not manufacturers of motor vehicles.”
In addition, EDF contends in its brief that “TTMA has likewise failed to demonstrate that its members will be irreparably harmed absent a stay of standards that simply require manufacturers to equip more of their trailers with widely used technologies that deliver fuel savings.” It also argues that TTMA’s motion is “littered with contradictions and belied by its remarkable eleven-month delay in seeking a judicial stay.”
The Phase 2 GHG/MPG rules are set to require compliance starting in Jan. 2018, which explains TTMA’s desire to secure a stay of the trailer provision. In addition, TTMA filed a lawsuit back in Dec. 2016 asking the D.C. Circuit to overturn the trailer portion of the Phase 2 rule. EDF and a coalition of public health and environmental groups are also intervenors in that case, along with the California Air Resources Board and a group of seven states (Connecticut, Iowa, Massachusetts, Oregon, Rhode Island, Vermont, and Washington). A three-judge panel of the D.C. Circuit will hear that case.
According to EDF, a stay of the trailer rule— if granted-- would “delay these critical health and environmental protections for the duration of the litigation, which could last for years.” HDT contacted TTMA on Oct. 13 for comment on its motion for stay and EDF’s counter filing, but no reply has been received.
“The trailer provisions of the [Phase 2] Clean Truck Standards are based on cost-effective and widely available measures that have long been used by industry leaders, and have been effectively incorporated into state standards for the past decade,” said EDF Attorney Alice Henderson in a statement. “It is critical that these common sense protections remain in place to reduce the dangerous pollution that causes climate change and save money for American families by reducing the costs for shipping goods.”
Meanwhile, TTMA has also been working the regulatory relief track as well in hopes of rolling back entirely or at least weakening the trailer provision. Both the Environmental Protection Agency and the National Highway Traffic Safety Administration, the joint promulgators of the GHG rules, advised TTMA on Aug. 17 that they reviewed TTMA’s petitions for reconsideration of the trailer provision and “agree that further rulemaking is needed.” However, neither agency has taken any further action.
Related: GHG Rule Review Pleases Trailer Makers, Concerns Some Stakeholders
More Fleet Management

Long-Awaited Canadian Border Bridge to Open in Detroit
For trucking, the bridge opening should offer immediate improvements in efficiency and reliability, with new customs facilities, expanded inspection capacity, and direct freeway-to-freeway connections.
Read More →
Aurora Rolls Out Next Generation of Driverless Trucks for Commercial Freight
Aurora's latest autonomous trucks it's rolling out with International feature lower-cost hardware designed for a million miles as the company expands commercial driverless freight operations across the U.S. Sun Belt.
Read More →
Freight Tonnage Down, Rates up, as Lower Capacity Powers Trucking Recovery
The recovery from the freight recession continues to be driven by reduction in capacity rather than by increased demand.
Read More →
Think Your Trucking Fleet Isn't Using Much AI? Think Again
Shadow AI — the use of unauthorized artificial intelligence tools at work — is becoming increasingly common, putting sensitive company data at risk. Learn how trucking fleets can protect sensitive data while embracing AI.
Read More →
ArcBest Consolidates Brands, Cuts Workforce
The company will bring three business units under the ArcBest brand, eliminate about 2% of positions, and expects the changes to generate $40 million in annual savings.
Read More →
Trucking Fleets Faced Record Operating Costs During Third Year of Freight Recession
ATRI's annual operational cost report shows carriers trimmed fleets, delayed equipment purchases, and ran older trucks as expenses continued to outpace freight rates.
Read More →
Michelin Adds AI Assistant to MyConnectedFleet Platform
Michelin’s new generative AI tool delivers instant fleet insights, helping managers analyze fuel use, tire maintenance, vehicle status, and operational performance without manually creating reports.
Read More →
LytxOne Platform Now Features AI, Compliance, and Asset Tracking Tools
New enhancements add AI-powered insights, asset tracking, compliance automation, and configurable privacy controls to Lytx's all-in-one fleet management platform.
Read More →
July Imports Poised to Set Container Record
The National Retail Federation projects July container imports will surpass the pandemic-era record as shippers frontload freight ahead of expected August tariff increases.
Read More →
HDT Announces 2026 Truck Fleet Innovator Finalists
From AI and fleet electrification to safety, operations, and leadership, these HDT Truck Fleet Innovator finalists are changing how trucking gets done.
Read More →

