EPA currently offers a "SmartWay designation" for over-the-road tractor-trailer combinations. This is a design-based label developed on the basis of test results for individual components that have been demonstrated to improve fuel efficiency and reduce emissions. There is, however, work being done to formalize certification criteria. Component testing alone is not sufficient, since the fuel-saving impacts can vary widely based upon vehicle configuration and application. The EPA recognizes that there is a wide variety of truck configurations for each base model and that it may not be possible to test every configuration to see if it meets the SmartWay performance specification. Recently, the EPA held a two-day workshop to discuss the draft of its SmartWay Truck Emissions Test Protocol.
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