EPA, NHTSA Propose Phase 2 Standards For Medium- And Heavy-Duty Engines And Vehicles

July 1, 2015

The U.S. Environmental Protection Agency (EPA) and the Department of Transportation’s National Highway Traffic Safety Administration (NHTSA) are jointly proposing a national program that would establish the next phase of greenhouse gas (GHG) emissions and fuel efficiency standards for medium- and heavy-duty vehicles. This “Phase 2 program” would significantly reduce carbon emissions and improve the fuel efficiency of heavy-duty vehicles, helping to address the challenges of global climate change and energy security.

The agencies are proposing new, more stringent standards for the same classes of heavy-duty vehicles currently regulated through model 2018 and beyond under Phase 1.

The agencies are proposing new CO2 and fuel consumption standards for vocational vehicles starting in model year (MY) 2021, with increased stringency in MY 2024, and a fully phased-in stringency level in MY 2027. The proposed vocational vehicle standards are differentiated using three vehicle weights and three driving cycles.

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