American Trucking Ass'ns, Inc. v. City of Los Angeles, 569 U.S. 641 (2013), was a case in which the Supreme Court of the United States held that certain regulations imposed by City of Los Angeles on trucking companies were preempted by federal law.[1] In 2006 the Board of Harbor Commissioners for Los Angeles, California adopted an environmental protection plan that included an effort called Clean Truck Program (CTP).[2] The stated goal of the program is to "reduce negative impacts that port [trucking] inflicts on the local community."[3] The implementation of this program began in 2007 and required trucking companies to comply with various requirements relating to maintenance of trucks, employment of drivers, and trucking operations.[4] The American Trucking Associations believed some of the regulations were in violation of the Federal Aviation Administration Authorization Act of 1994 (FAAAA) and filed suit.[5] Litigation eventually made its way up to the Supreme Court of the United States,[6] where the Court held that two of the requirements of the CTP were in violation of the FAAAA.[7]