EPA and the U.S. Department of Transportation’s (DOT’s) National Highway Traffic Safety Administration have signed a proposed rule that would set fuel economy and greenhouse gas (GHG) emissions standards for medium- and heavy-duty trucks and buses. The proposed standards would apply to vehicles in model years 2014 through 2018 and would cut fuel use and emissions from new trucks by as much as 20 percent by 2018, according to the agencies. The proposal would set separate standards for large highway combination tractors that typically pull trailers; heavy-duty pickups and vans; “vocational” trucks, such as garbage, cement and utility vehicles; and buses. EPA is also proposing standards for nitrogen oxide and methane emissions from truck engines. The agencies will accept comments on the proposed rule for 60 days after it is published in the Federal Register.