ATDynamics (Advanced Transit Dynamics) designs and delivers technologies that increase the energy efficiency of freight transportation. Its AeroTrailer Package features the TrailerTail and ATD-Transtex Skirts which, the company says, can improve highway fuel economy by up to 12%, based on SAE Type II testing and on-road results. The skirts are sufficient for standalone compliance with 2010 CARB regulations for trailer aerodynamics and are approved as Advanced Trailer Skirts by the U.S. EPA SmartWay program.