FILE - In this April 22, 2014 file photo, drivers enter Sacramento on Highway 50 to come to a near stand still as traffic backs up in West Sacramento, Calif. The U.S. Transportation Department is moving to reverse former President Donald Trump's bid to end California's ability to set its own automobile tailpipe pollution standards. The National Highway Traffic Safety Administration, which is part of the DOT, said Thursday, April 22, 2021 it is proposing to withdraw a rule rule meant to stop states from setting their own requirements for greenhouse gases, zero emissions vehicles and fuel economy. .(AP Photo/Rich Pedroncelli, File)