they tend to pose bigger road hazards than smaller vehicles. s mThe main goal of commercial vehicle inspection is to make sure that it is safe to be out on the road with other smaller cars.Most commercial vehicles run on gasoline and diesel fuel. Both contain hydrocarbons. If the vehicle does not have a properly-functioning engine, it is not that capable in reducing the pollutants that it emits. A well-maintained engine works in taking oxygen and using it to turn hydrogen into water so that very little pollutants are emitted into the air. This adheres to the Clean Air Act. - See more at: http://www.commercialtruckinspection.com/