for well over 50% of the US market in those days, owing to overall length regulations that limited the bumper-to-taillight dimension of a semitrailer unit to 55 ft on interstate highways. Conventionals were popular on western roads due to more convenient ingress/egress, better ride, and easier access to the engine for servicing. In 1979, a new plant in Mount Holly, North Carolina, and a parts manufacturing plant in Gastonia, North Carolina, were constructed, both in the Charlotte metropolitan area. Volumes continued to increase. The year 1979 marked a consequential event in the evolution of Freightliner, and of the whole trucking and truck manufacturing industries. President Carter signed bills into law deregulating transport both on the ground and in the skies. Deregulation changed the economics of trucking and removed the system of regulated carriage that protected carriers, instead allowing more competition. 1980s Three years later, the Surface Transportation Assistance Act of 1982 relaxed weight and length standards and imposed a new excise tax on heavy trucks and the tires they use. No longer was the overall length of semitrailer combinations restricted; rather, only the trailer was specified, to be not greater than 53 ft in length. Individual states retained more restrictive overall length laws, but fundamentally, the rules had changed forever. Consolidated Freightways, a traditional, unionized carrier that flourished in the era before deregulation, realized it was in a fight for its life. In May 1981, it sold its truck manufacturing business and the Freightliner brand to Daimler-Benz, allowing it to concentrate its management attention and financial resources on its traditional trucking business. Around this time, the Chino and Indianapolis plants were closed permanently. Consolidated Freightways continued carrier business until 2002, when it ceased operation on Labor Day weekend. In 1985 Freightliner introduced a new Medium Conventional series (FLC112), using the passenger portion of the cabin from the then recently introduced Mercedes-Benz LK. Mercedes cabins gradually became used for a number of Freightliner trucks. In 1989, Freightliner acquired a standing plant in Cleveland, North Carolina, near Statesville, that had been producing transit buses for German manufacturer MAN. 1990s In 1991, parent company Daimler-Benz withdrew from the medium-duty truck segment, shifting its presence to Freightliner. Serving as the replacement for the aging Mercedes-Benz L1117, the Business Class made its debut. Also called the FL series, the Business Class was a downsized version of the FLC112, sharing its cab with the Mercedes-Benz LKN