Home - EMA - Engine Manufacturers Association The Truck and Engine Manufacturers Association EMA represents worldwide manufacturers of internal combustion engines and onhighway medium and heavyduty trucks. EMA works with government and industry to help the nation achieve its goals of cleaner air and safer highways and to ensure that environmental and safety standards and regulations are technologically feasible costeffective and provide safety and environmental benefits. Through continuing improvements in truck and engine technology emissions control and safety systems our members are the leaders in providing efficient engine power and safer vehiclesthat both enhance environmental protection and public safety of the global transportation system. EMA sponsors scientific and technical research to improve engine and truck performance and fuel efficiency reduce emissions and enhance safety and is a leading advocate on those issues around the world.