FILE - In this Feb. 11, 2014, file photo, truck drivers stop at a gas station in Emerson, Ga., north of metro Atlanta, to fill up their tractor trailer rigs. The Biden administration is proposing stronger pollution regulations for new tractor-trailer rigs that would clean up smoky diesel engines and encourage new technologies during the next two decades. The proposal released Monday by the Environmental Protection Agency would require the industry to cut smog-and-soot-forming nitrogen oxide emissions by up to 90% per truck over current standards by 2031. (AP Photo/David Tulis, File)