One chart included in the U.S. Dept. of Energy’s Alternative Fuels Data Center, or AFDC, shows the Federal Highway Administration’s vehicle class types based on weight. A second chart shows vehicle weights, weight classes and categories as defined by three government agencies: the Federal Highway Administration, the U.S. Census Bureau and the U.S. Environmental Protection Agency, or EPA, as listed by the AFDC.
The Federal Highway Administration breaks its system into eight separate classes, labeled as numbers one through eight, according to the AFDC's chart, whereas the U.S. Census Bureau has four classes, categorized by use, such as light or heavy duty. The EPA's Emissions Classification system includes two broad categories of vehicles, heavy and light duty, and four sub-categories, which are further subdivided by vehicle weight.
The California Weight Limitations chart includes gross weight and axle weight maximum for vehicle units, as shown by the California Dept. of Transportation, or Caltrans. The chart condenses California Vehicle Code regulations regarding weight. Weight class, based on the shipping weight listed on the vehicle manufacturer’s statement of origin and range of weight, in pounds, figure into vehicle registration rates, as of March 1, 2014, reports the State of New Jersey Motor Vehicle Commission.