developments in technology, such as computers, satellite communication, and the internet, have contributed to many improvements within the industry. these developments have increased the productivity of company operations, saved the time and effort of drivers, and provided new, more accessible forms of entertainment to men and women who often spend long periods of time away from home. in 2006, the united states environmental protection agency implemented revised emission standards for diesel trucks (reducing airborne pollutants emitted by diesel engines) which promises to improve air quality and public health.