Heavy-Duty Vehicle Greenhouse Gas (GHG) Emissions Regulations

Box-type trailers that are at less than or equal to 50 feet long and the heavy-duty tractors that pull these trailers must be equipped with fuel-efficient tires and aerodynamic trailer devices that improve fuel economy and lower GHG gas emissions. Tractors and trailers subject to the regulation must either use U.S. Environmental Protection Agency SmartWay certified tractors and trailers or retrofit existing equipment with SmartWay verified technologies. Vehicle owners must comply with these regulations when operating on California highways regardless of where the vehicles are registered. Exemptions apply for some local- and short-haul tractors and trailers. The compliance schedule depends on the type and age of the tractor or trailer. For more information, see the California Air Resources Board Heavy-Duty GHG Regulations website.

(Reference California Code of Regulations Title 17, Section 95300-95311)